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Chemistry:. Atomic Structure. by Tim F. Rowbotham - modified in 2008 , 2011 . Pre-Assessment Questions. Ready your remote. Which of the following is the most accurate model of the structure of an atom?. Tiny solid sphere Tiny solar system Spherical Cloud Chocolate chip cookie. - PowerPoint PPT Presentation
Citation preview
Chemistry:Atomic
Structureby Tim F. Rowbotham - modified in 2008 , 2011
Pre-Assessment Questions
• Ready your remote
Which of the following is the most accurate model of the structure of an atom?
0%
0%
0%
0% 1. Tiny solid sphere2. Tiny solar system3. Spherical Cloud4. Chocolate chip cookie
Which of the following is not a particle found in an atom?
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0%
0%
0% 1. Neutron2. Electron3. Proton4. Cathode
The Mass Number of an atom is the total number of what?
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0%
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0% 1. Protons & Electron2. Protons & Neutrons3. Neutrons & Electrons4. Protons, Neutrons & Electrons
The Atomic Number of an atom is the total number of what in an atom?
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0%
0%
0% 1. Protons2. Protons & Electrons3. Protons, Neutrons & Electrons4. Chemical Bonds
Which of the following has a negative charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Positron
Atomic Structure Notes•PAGE 1
Chemistry:Atomic
StructureCreated in 2008 by Tim F. Rowbotham
Atomic History• Ancient Greeks thought there were only 4 elements: earth, air, fire, & water.
• All matter, they thought, included one or more of these elements.
Atomic History• Democritus (440 BC) was the first to challenge this idea.
• He thought that matter could eventually be divided up into its smallest piece. This piece he theorized, he called atomos, which means “indivisible.”
Atomic Theory• In 1802, John Dalton (a British school teacher) proposed an atomic theory, which included several ideas.
• Dalton’s Atomic Theory VIDEO CLIP
Dalton’s Atomic Theory
• Atoms are tiny, invisible spheres impossible to break.
• Atoms of different elements are different and have specific masses.
• Atoms can combine in exact ratios to form compounds.
Thompson’s Model
• In the late 1800s, JJ Thompson discovered that there were negatively charged particles which he called electrons. He pictured the atom as a ball of positive charge with negatively charged electrons floating in it.
• VIDEO CLIPS:• THOMSON ,
THOMSON feat Eminem
Rutherford’s Model
• In 1911, Ernest Rutherford determined that the center of the atom had a positive charge.
• This positively charged center was called the nucleus.
• RUTHERFORD• Rutherford Gold Foil Experiment - Backstage Science
Chadwick’s Discovery
• James Chadwick discovered that the nucleus also held particles with no charge, which he called neutrons.
• The positively charged particles in the nucleus were called protons.
The Bohr Model• Neils Bohr hypothesized that the atom was like a tiny solar system, with electrons circling the nucleus in well defined orbits like planets
• The speculated paths of the electrons were called orbitals, shells, or energy levels.
Modern Atomic Theory• It was later discovered that
electrons do not have well defined orbits, but rather move much more haphazardly.
• In fact, Heisenberg determined that we can not simultaneously know the location and velocity of an electron!!!
• Uncertainty principle 1• Uncertainty Principle 2• Schrodinger’s Cat – Big Bang Theory
Electron Cloud Model• However, each electron has certain regions where it is more likely to be found.
• The electron cloud describes the “blur” created from the more frequent movement of electrons through these regions.
Electron Cloud Model
• The electron cloud is a spherical cloud around the nucleus that shows were an electron is most likely to be.
• It is the most accurate model of an atom, but not the most useful.
Electron Cloud Model
The denser areas are where the electrons are MOST likely to be.Atomic Model Video Clip
Learning Checks• Ready your remote
Which of the following is the most accurate model of the structure of an atom?
0%
0%
0%
0% 1. Spherical Cloud2. Tiny solid sphere3. Tiny solar system4. Chocolate chip cookie
Which scientist is considered the Father of Chemistry because of his atomic theory?
0%
0%
0%
0% 1. J.J. Thomson2. Neils Bohr3. John Dalton4. James Chadwick
Learning Checks•Return your remote
• Read & Complete p.10 – 11 “Particles of Matter”
Review Questions•Ready your remote
Which part of Dalton’s Atomic theory was later found out to be incorrect?
0%
0%
0%
0% 1. Atoms of different elements are different2. Atoms are tiny unbreakable spheres3. Atoms combine in specific ratios4. Different atoms have different masses
Which of the following is the most accurate model of the structure of an atom?
0%
0%
0%
0% 1. Tiny solid sphere2. Tiny solar system3. Spherical Cloud4. Chocolate chip cookie
Atomic Structure Notes•PAGE 3
Subatomic Particles
• An atom consists of a positive core called a nucleus, which contains positive protons and neutral neutrons.
• This nucleus is surrounded by a cloud of negatively charged electrons.
The Charge of Atoms
• Alone, atoms are electrically neutral.
• This means that they have no OVERALL electric charge.
• The positive charge of an atom is exactly equal to its negative charge.
The Negative of Atoms
• The extremely rapid movement of electrons forms the cloud of negative charge outside an atom’s nucleus.
• Each electron has a charge of -1.
The Positive of Atoms
• The nucleus of an atom holds a positive charge due to the presence of protons.
• Each proton has a charge exactly opposite to that of an electron equaling +1.
The Nucleus of an Atom
• The nucleus of an atom contains the bulk of the mass of the atom.
• In it are positively charged protons and neutrons, which have NO charge.
Atomic Mass Unit• Because atoms are so small, we use a special unit of measurement called an atomic mass unit.
• An atomic mass unit is really equal to about 1.66 x 10-27 kg.
Masses of Subatomic Particles
• A Proton’s mass = 1 a.m.u.• A Neutron’s mass = 1 a.m.u.• A Electron’s mass = 0 a.m.u.*
*An electron has a mass of 1/1836th of a proton (which is relatively insignificant)
Charges of Subatomic Particles•A Proton’s charge = +1
•A Neutron’s charge = 0
•A Electron’s charge = -1
COMPLETE THIS TABLE
Sub-atomic Particle
Proton Neutron Electron
Mass
Charge
Location
COMPLETE THIS TABLESub-
atomic Particle
Proton Neutron Electron
Mass 1 amu 1 amu 0 amu
Charge +1 0 -1
Location nucleus nucleus electron cloud
Exit QuestionsReady your remote
Which of the following is the most accurate model of the structure of an atom?
0%
0%
0%
0% 1. Tiny solid sphere2. Tiny solar system3. Spherical electron cloud4. Chocolate chip cookie
Which of the following has a positive charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Beta particle
Which of the following has a mass of 1 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
Modern Atomic TheoryReturn your remoteAtom – Bill Nye VIDEO
Read & complete PACKET pages 12-13“What is Matter?”
Entrance Review Questions•Ready your remote
Which of the following has a mass of 1 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
Which of the following has no considerable mass (effectively making it 0 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
Which subatomic particle has a negative charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Positron
Which subatomic particle has a positive charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Beta particle
Which subatomic particle has no overall charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Quark
Atomic Structure Notes•PAGE 4
Atomic Number• The atomic number is the number of protons in an atom.
• It is a unique property that identifies the element.
• (If it has a different number of protons it is a different element!!!)
Atomic Number• For example, an atom with 6 protons would be carbon.
• But if a proton could be knocked free, then it would become boron, because boron has 5 protons!!!
What is the atomic number of oxygen?(USE THE PERIODIC TABLE)
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0%
0%
0% 1. 22. 83. 164. 24
How many protons does an oxygen atom have?
0%
0%
0%
0% 1. 22. 83. 164. 24
What is the atomic number of calcium?
0%
0%
0%
0% 1. 62. 173. 204. 40
How many protons are there in a calcium atom?
0%
0%
0%
0% 1. 62. 173. 204. 40
How many protons are there in an argon atom?
0%
0%
0%
0% 1. 182. 403. 484. 58
Mass Number• Since electrons have virtually no mass (1/1836th of a proton), the mass of an atom is determined by adding only the number of protons & neutrons and is called its mass number.
Mass Number• Mass Number is also referred to as Atomic Mass or Atomic Weight
• Mass # = # protons + # neutrons
• Model of the Atom video clip• Atomic Number & Mass Number
video clip
What is the mass # of an atom with 2 protons, 2 neutrons, & 2 electrons?
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0%
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0% 1. 2 2. 4 3. 6 4. 8
What is the mass # of an atom with 3 protons, 4 neutrons, & 3 electrons?
0%
0%
0%
0% 1. 3 2. 6 3. 7 4. 10
What is the atomic # of an atom with 3 protons, 4 neutrons, & 3 electrons?
0%
0%
0%
0% 1. 3 2. 6 3. 7 4. 10
What type of atom would have 3 protons, 4 neutrons, & 3 electrons?
0%
0%
0%
0% 1. Lithium2. Beryllium3. Nitrogen4. Neon
What is the mass # of an atom with 9 protons, 10 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 9 2. 10 3. 19 4. 28
What is the atomic # of an atom with 5 protons, 6 neutrons, & 5 electrons?
0%
0%
0%
0% 1. 52. 63. 104. 11
Review Questions•Return your
remote• Complete PACKET p.15
– 16 “The Amazing Atom”
JOURNAL # 1: Half Sheet
Create a table showing the mass, charge, &
location of each subatomic particle.
Entrance QuestionsReturn your remoteGet in groups of 2 – 4
Get 1 Atom Poster & 1 bag of subatomic particles & 1 Atom Building worksheet per group
Atom Building4
He2
MASS #
ATOMIC #
This is a short- hand way
chemists use to write down a
lot of info about an atom!!
ChemicalSymbol
Atom Building4
He2
MASS # = neutrons + protons
ATOMIC # = protons= electrons, if neutral
We can also figure out the
number of protons
neutrons & electrons from
this info
Neutrons = MASS# – ATOMIC #
Atom Building4
He2
M # = n + p =
A# = p = = e
Using the protons, neutrons, & electrons
provided, create a model of this helium atom.
(It has 2 protons, 2 neutrons, & 2
electrons.)RECORD THIS INFO ON YOUR
ATOM BUILDING WORKSHEET
n= M# – A# = 2
Atom Building1
H1
Continue Atom Building with this
atom and record all the information on the Atom Building
work sheet
Atom Building9
Be4
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building12
C6
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building19
F9
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building20
Ne10
Build this atom and record all the
information on the Atom Building work
sheet
QuizNo Talking or Sharing
AnswersWhen you finish turn your
quiz face down on the desk wait quietly for further directions
You have 15 minutes
Atom BuildingPass in your QuizGet in groups from yesterday
Get 1 Atom Poster & 1 bag of subatomic particles & 1 Atom Building worksheet per group
Atom Building14
N7
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building24
Mg12
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building23
Na11
Build this atom and record all the
information on the Atom Building work
sheet
Atom Building• Don’t forget to clean up
your Atom Building Particles before you leave.• Complete pages 17 – 18
“Observing Atoms”
Entrance Questions
Ready your remote
Which of the following is the most accurate model of the structure of an atom?
0%
0%
0%
0% 1. Tiny solid sphere2. Tiny solar system3. Spherical electron cloud4. Chocolate chip cookie
Which of the following has a positive charge?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Beta particle
Which of the following has a mass of 1 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
Which of the following has a mass of 1 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
Which of the following has a mass of 1 amu?
0%
0%
0%
0% 1. Proton2. Neutron3. Electron4. Proton & Neutron
How do you find the mass # of an atom?
0%
0%
0%
0% 1. Protons2. Neutrons3. Protons + Neutrons4. Protons + Neutrons + Electrons
How do you find the atomic # of an atom?
0%
0%
0%
0% 1. Protons2. Neutrons3. Protons + Neutrons4. Protons + Neutrons + Electrons
What is the mass # of an atom with 6 protons, 8 neutrons, & 6 electrons?
0%
0%
0%
0% 1. 62. 12 3. 14 4. 20
What type of atom would have 4 protons, 6 neutrons, & 4 electrons?
0%
0%
0%
0% 1. Lithium2. Beryllium3. Nitrogen4. Neon
Atoms Review• Half a sheet of paper with your
neighbor!• Draw and identify each of the
following atoms of elements, labeling properly the protons, neutrons, and electrons in their correct locations.
• Pay attention and copy the example that we do together as a class!
Atoms & Chemical Bonding Flip Chart
Atomic #ProtonsElectronsBohr ModelsValence ElectronsElectron Dot DiagramIonic Bond
Mass #NeutronsEnergy LevelChargeValence ShellOxidation #Covalent Bond
Entrance Questions
Ready your remote
Notes - Isotopes• Turn to page 5 of your Atomic Structure Packet
Isotopes• All atoms of a certain element will have EXACTLY the same amount of protons, however, some atoms of the same element may have DIFFERING numbers of neutrons.
• These are called isotopes of that element.
Isotopes• Isotopes have the SAME number of protons, but a DIFFERENT number of neutrons.
• Since isotopes have DIFFERENT amounts of neutrons, they will have DIFFERENT mass numbers!!!
Isotopes• Isotopes are referred to as the element followed by the mass number.
• Carbon-12 has a mass of 12. Carbon-13 has a mass of 13. Carbon-14 has a mass of 14.
Average Mass Number
• SPECIAL NOTE: The mass numbers listed on the periodic table are AVERAGE MASS NUMBERS of those elements, because each element may a have a number of different isotopes!!!
Examples of Isotopes
Carbon-12 Carbon-14
___ protons ___ protons
___ neutrons ___ neutrons
___ electrons ___ electrons
Examples of IsotopesCarbon-12 Carbon-14
6 protons 6 protons
6 neutrons 8 neutrons
6 electrons 6 electrons
Examples of Isotopes
Neon-20 Neon-22
____ protons ____ protons
____ neutrons ____ neutrons
____ electrons ____ electrons
Examples of Isotopes
Neon-20 Neon-22
10 protons 10 protons
10 neutrons 12 neutrons
10 electrons 10 electrons
Examples of Isotopes
Sodium-23 Sodium-24
____ protons ____ protons
____ neutrons ____ neutrons
____ electrons ____ electrons
Examples of IsotopesSodium-23 Sodium-24
11 protons 11 protons
12 neutrons 13 neutrons
11 electrons 11 electrons
Examples of Isotopes
Phosphorus-31 Phosphorus-32
____ protons ____ protons
____ neutrons ____ neutrons
____ electrons ____ electrons
Examples of Isotopes
Phosphorus-31 Phosphorus-32
15 protons 15 protons
16 neutrons 17 neutrons
15 electrons 15 electrons
Examples of Isotopes
Iron-56 Iron-58
____ protons ____ protons
____ neutrons ____ neutrons
____ electrons ____ electrons
Examples of Isotopes
Iron-56 Iron-58
26 protons 26 protons
30 neutrons 32 neutrons
26 electrons 26 electrons
Examples of IsotopesChlorine-35 Chlorine-37
____ protons ____ protons
____ neutrons ____ neutrons
____ electrons ____ electrons
Examples of IsotopesChlorine-35 Chlorine-37
17 protons 17 protons
18 neutrons 20 neutrons
17 electrons 17 electrons
Review QuestionsReady your remote
What do you call atoms that have the same number of protons, but different masses?
0%
0%
0%
0% 1. Heavy atoms2. Radioactive atoms3. Isotopes4. Ions
What is the mass # of an atom with 9 protons, 10 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 9 2. 10 3. 19 4. 28
What is the mass # of an atom with 9 protons, 11 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 29 2. 20 3. 18 4. 9
What is the mass # of an atom with 9 protons, 12 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 92. 123. 214. 30
IsotopesReturn your remoteVIDEO CLIP REVIEW:Protons, Neutrons, Electrons - IsotopesComplete PACKET pages
Entrance QuestionsReady your remote
What do you call atoms that have the same atomic number, but different mass numbers?
0%
0%
0%
0% 1. Isotopes2. Ions3. Heavy atoms4. Radioactive atoms
What is the atomic number of calcium?
0%
0%
0%
0% 1. 62. 173. 204. 40
What is the mass # of an atom with 9 protons, 10 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 9 2. 10 3. 19 4. 28
End of Entrance QuestionsReturn your remoteGet in groups of 2 – 4
Get 1 Atom Poster & 1 bag of subatomic particles & 1 “Atom Building – Isotopes” worksheet per group
Atom Building - Isotopes4
He2
MASS #
ATOMIC #
Remember the short- hand
way chemists use to write
down a lot of info about an
atom?
ChemicalSymbol
Atom Building - Isotopes4
He2
MASS # = neutrons + protons
ATOMIC # = protons= electrons, if neutral
We can figure out the
number of protons
neutrons & electrons from
this info
Neutrons = MASS# – ATOMIC #
Atom Building - Isotopes4
He2
M # = n + p =
A# = p = = e
Using the protons, neutrons, & electrons
provided, create a model of this helium atom.
(It has 2 protons, 2 neutrons, & 2
electrons.)n= M# – A# = 2
Atom Building - Isotopes5
He2
Continue Atom Building with this isotope of helium and record all the information on the
Atom Building work sheet
Atom Building - Isotopes7
Li3
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes8
Li3
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes12
C6
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes14
C6
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes20
F9
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes21
F9
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes22
Ne10
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes20
Ne10
Build this atom and record all the
information on the Atom Building –
Isotopes work sheet
Atom Building - Isotopes
• Don’t forget to turn in your “Atom Building – Isotopes”
work sheet into your class bin before you leave.
• Complete PACKET page 21“Atoms R Us”
Entrance QuestionsReady your remote
What type of atom would have 7 protons, 8 neutrons, & 10 electrons?
0%
0%
0%
0% 1. Lithium2. Beryllium3. Nitrogen4. Neon
What is the mass # of an atom with 5 protons, 6 neutrons, & 5 electrons?
0%
0%
0%
0% 1. 102. 163. 54. 11
What would be the charge of an atom with 7 protons, 7 neutrons, & 8 electrons?
0%
0%
0%
0% 1. -1 2. 03. +14. +2
What would be the charge of an atom with 15 protons, 16 neutrons, & 18 electrons?
0%
0%
0%
0% 1. -3 2. -13. +14. +3
End of Entrance QuestionsReturn your remoteGet in groups of 2 – 4
Get 1 Atom Poster & 1 bag of subatomic particles & 1 “Atom Building – Isotopes & Ions” worksheet per group
Atom Building – Isotopes & Ions
23
Na11
MASS #
ATOMIC #
Remember the short- hand way chemists use to write down a lot of info about an
atom?
Build this atom on your poster & record
it on your “Atom Building – Isotopes &
Ions” work sheet
ChemicalSymbol
Atom Building – Isotopes & Ions
23 +1
Na11
MASS #
ATOMIC #
Chemists also add charge to the upper
right of the chemical symbol
ChemicalSymbol
CHARGE
Atom Building – Isotopes & Ions
23 +1
Na11
M# = n+p
A# = p
By definition, The atomic
number is the number of
protons, so it WILL NOT CHANGE. Charge
comes from a change in the number of electrons
ChemicalSymbol
CHARGE = p – e
Atom Building – Isotopes & Ions
23 +1
Na11
M# = n+p
A# = p
Charged atoms are
called ions.ChemicalSymbol
CHARGE = p – e
# electrons = # protons – CHARGE
Atom Building – Isotopes & Ions
23 +1
Na11
M# = n+p =
A# = p =
ChemicalSymbol
CHARGE = p – e
# electrons = 11 – (+1) = 10
# neutrons = M# – A# = 23 – 11 = 12
Change your atom
to build this ion on your
poster & record it on your “Atom Building – Isotopes & Ions” work
sheet
Atom Building – Isotopes & Ions7
Li3
Continue Atom Building with this lithium atom and
record all the information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions7 +1
Li3
Build this ion and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions10 +2
Be4
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions20 -1
F9
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions14 -3
N7
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions18 -2
O8
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions12 +3
B5
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions3
H1
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions14
C6
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions16 -2
O8
Build this atom and record all the
information on the “Atom Building – Isotopes & Ions”
work sheet
Atom Building – Isotopes & Ions• Don’t forget to turn in your “Atom Building – Isotopes & Ions” work sheet into your class bin before you leave.
• Complete PACKET page 22 “Parts of An Atom”
JOURNAL ENTRY• Turn to Journal # 2
JOURNAL #2
Draw Models of the following atoms:
20 20 -1 25 25 +2
F F Mg Mg 9 9 12 12
Energy Level Smarts!!!
• YOU MAY EAT THE SMARTIES AT THE END OF CLASS!!!!
• UNTIL FURTHER NOTICE, THEY ARE ELECTRONS
Entrance QuestionsReady your remote
What is the mass # of an atom with 8 protons, 10 neutrons, & 10 electrons?
0%
0%
0%
0% 1. 82. 103. 184. 20
What would be the charge of an atom with 8 protons, 10 neutrons, & 10 electrons?
0%
0%
0%
0% 1. -2 2. 03. +14. +2
What is the mass # of an atom with 9 protons, 10 neutrons, & 9 electrons?
0%
0%
0%
0% 1. 9 2. 10 3. 19 4. 28
Atomic Structure Notes
• Turn to page 7 of your Atomic Structure Packet
The Electron Cloud
• Even though electrons move haphazardly outside the nucleus, there are certain regions where an electron is more likely to be.
• We call these regions energy levels. (They are also referred to as orbitals or shells).
Energy Levels• Electrons have more energy as they get further away from the nucleus.
• The higher the energy, the further away from the nucleus.
• (The first energy level is closest to the nucleus)
Energy Levels• Electrons will usually be found in the lowest energy level possible.
• Each energy level has a maximum number of electrons it will contain at a time.
Energy Level Capacity
Energy Level Name Max # Electrons
1st K 22nd L 83rd M 184th N 325th O 32?6th P 32?7th Q 32?
Electrons in Energy Levels• Electrons will first be located
in the lowest energy levels• When lower energy levels are full, additional electrons will be in the next lowest energy level
**It does get more complicated than just filling the lowest levels first.**
Lots of Energy Levels!?!• In energy levels that can
contain more than 8 electrons...• Once the lowest energy level contains 8 electrons, the next 2 electrons will be found in the next highest energy level, before filling that lower level
Hydrogen’s ? Electron
Energy Level # Electrons
1st
2nd
3rd
4th
Hydrogen’s 1 Electron
Energy Level # Electrons
1st 1
2nd -
3rd -
4th -
Carbon’s ? Electrons
Energy Level # Electrons
1st
2nd
3rd
4th
Carbon’s 6 Electrons
Energy Level # Electrons
1st 2
2nd 4
3rd -
4th -
Neon’s ? ElectronsEnergy Level # Electrons
1st
2nd
3rd
4th
Neon’s 10 Electrons
Energy Level # Electrons
1st 2
2nd 8
3rd -
4th -
Aluminum’s ? Electrons
Energy Level # Electrons
1st
2nd
3rd
4th
Aluminum’s 13 Electrons
Energy Level # Electrons
1st 2
2nd 8
3rd 3
4th -
Calcium’s ? Electrons
Energy Level # Electrons
1st
2nd
3rd
4th
Calcium’s 20 Electrons
Energy Level # Electrons
1st 2
2nd 8
3rd 8
4th 2
Iron’s ? ElectronsEnergy Level # Electrons
1st
2nd
3rd
4th
Iron’s 26 ElectronsEnergy Level # Electrons
1st 2
2nd 8
3rd 14
4th 2
Review Questions
Ready your remote
You may now eat your electrons… or
Smarties
How many electrons are in the 3rd energy level of a magnesium atom?
0%
0%
0%
0% 1. 22. 63. 124. 24
How many electrons are in the 2nd energy level of a nitrogen atom?
0%
0%
0%
0% 1. 22. 53. 74. 8
How many electrons are in the 3rd energy level of a chlorine atom?
0%
0%
0%
0% 1. 22. 73. 94. 17
Energy LevelsReturn your remote
Entrance QuestionsReady your remote
What is the mass # of an atom with 10 protons, 11 neutrons, & 10 electrons?
0%
0%
0%
0% 1. 10 2. 21 3. 204. 31
What is the charge of an atom with 15 protons, 16 neutrons, & 18 electrons?
0%
0%
0%
0% 1. -3 2. -13. +14. +3
JOURNAL # 3
Create a table showing the maximum number of electrons
in each energy level.Share the “special rule” for
electrons in the 3rd through 7th energy levels.
Energy Level Capacity
Energy Level Name Max # Electrons
1st K 22nd L 83rd M 184th N 325th O 32?6th P 32?7th Q 32?
Bohr Models• Because these different
energy levels exist, a Bohr model or (electron shell diagram) is a good visual of the location of electrons.
• Remember this is NOT what an atom really looks like, but is much more organized than reality.
Drawing Bohr Models• It is a simple drawing of a
number of concentric circles.• The innermost circle contains
information about the nucleus (The number of protons & neutrons)
• The next circle out would be the 1st energy level, the next circle out the 2nd energy level, then the 3rd, and so on.
Electron Shell Diagram of Carbon
Electron Shell Diagram of Aluminum
Electron Shell Diagram of
Calcium
Electron Shell Diagram of Iron
Review QuestionsReady your remote
How many electrons are in the 3rd energy level of a chlorine atom?
0%
0%
0%
0% 1. 22. 73. 94. 17
How many electrons are in the 2nd energy level of an oxygen atom?
0%
0%
0%
0% 1. 22. 43. 64. 8
What is the maximum number of electrons in the 3rd energy level?
0%
0%
0%
0% 1. 22. 63. 84. 18
Assignments1.) Place your remote inside the
correct pocket!! 2. )Complete p.23-24 Bohr
Models
JOURNAL #4
Draw BOHR MODELS of the following atoms:
17 20 -1 28 27 +3
O F Al Al 8 9 13 13
Review QuestionsReady your remote
How many protons are in oxygen-18?
0%
0%
0%
0% 1. 8 2. 9 3. 104. 18
How many neutrons are in oxygen-18?
0%
0%
0%
0% 1. 8 2. 9 3. 104. 18
How many protons are in phosphorus-32?
0%
0%
0%
0% 1. 152. 163. 174. 32
How many neutrons are in phosphorus-32?
0%
0%
0%
0% 1. 152. 163. 174. 32
How many electrons would be in an atom with a neutral charge ( equal to 0)?
0%
0%
0%
0% 1. One less than a neutral atom2. One more than a neutral atom3. Two more than a neutral atom4. Same as the protons
How many electrons would be in an atom with a charge of -1?
0%
0%
0%
0% 1. One less than a neutral atom2. One more than a neutral atom3. Two more than a neutral atom4. Same as the protons
How many electrons would be in an atom with a charge of +1?
0%
0%
0%
0% 1. One less than a neutral atom2. One more than a neutral atom3. Two more than a neutral atom4. Same as the protons
Assignments1.) Return your remote2.) Complete PACKET p.25 Atomic
AlphabetLIST ONLY IMPORTANT TERMS (NOT NAMES OF ELEMENTS)
SOME LETTERS MAY BE BLANK 3.) Your Packet should be complete
now 4.) Atomic Structure Test FRI Jan 6
Atoms & Chemical Bonding Flip Chart
Atomic #ProtonsElectronsBohr ModelsValence ElectronsElectron Dot DiagramIonic Bond
Mass #NeutronsEnergy LevelChargeValence ShellOxidation #Covalent Bond
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