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Atom Ions and Isotopes.notebook 1 October 15, 2014 Oct 147:06 PM WEDNESDAY, OCT. 15 1. The mass number of the atom is the total number of ________________ & ____________________. 2. What are the three particles in an atom and what is each of their charges? 3. The symbol for elements is commonly written like the example shown to the right. a. What does the 16 represent? ____________________________ b. What does the 8 represent? ____________________________ c. What is the name of the element? ________________________ Oct 147:13 PM 4. Write the appropriate symbol (like the one above with numbers) for aluminum. ___________ 5. Use the Diagram Below to Answer the Following Questions: a. Which element is represented in element X? _________ b. Which element is represented in element Y? _______ c. Which element (if any) has the greater mass number? ______

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Page 1: Atom Ions and Isotopes.notebook

Atom Ions and Isotopes.notebook

1

October 15, 2014

Oct 14­7:06 PM

WEDNESDAY, OCT. 15

1. The mass number of the atom is the total number of________________ & ____________________.

2. What are the three particles in an atom and what is each oftheir charges?

3. The symbol for elements is commonly written like the example

shown to the right. a. What does the 16 represent?____________________________ b. What does the 8 represent?____________________________ c. What is the name of the element?________________________

Oct 14­7:13 PM

4. Write the appropriate symbol (like the one above with numbers) for aluminum. ___________

5. Use the Diagram Below to Answer the Following Questions:

a. Which element is represented in element X? _________

b. Which element is represented in element Y? _______

c. Which element (if any) has the greater mass number? ______

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Atom Ions and Isotopes.notebook

2

October 15, 2014

Oct 14­4:59 PM

Atoms, Ions, and Isotopes

Oct 14­4:59 PM

Quick Review

• Atoms are made up of three particles:

• Which of the three particles identifies what element an atom is?

neutronprotonnucleuselectron

LABEL THE ATOM

PUSH

PROTONS NEUTRONS ELECTRONS

PROTONS

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October 15, 2014

Oct 14­4:59 PM

Review• Most of an atom's mass is contained in the nucleus

• Check out the comparison chart below:

Notice how protons and neutrons have about the same mass, but electrons are much smaller

PARTICLE SYMBOL MASS RELATIVE MASS

Proton p+ 1.67 x 10­27 kg 1 amu

Neutron n0 1.67 x 10­27 kg 1 amu

Electron e­ 9.11 x 10­31 kg 1/1840 amu

Proton

Oct 14­4:59 PM

Different Forms of the Same Element

• In any element, the # of protons is always constant

• Number of electrons and neutrons can vary within an element without changing the identity of the element> Ex.  Carbon (C) ALWAYS has 6 protons, but it can have 6­8 neutrons and 2­10 electrons

• Mass Number can change also > Mass Number = Protons + Neutrons

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October 15, 2014

Oct 14­4:59 PM

Isotopes• An ISOTOPE is a form of an element that has a different number of neutrons than “normal”

• Carbon has three isotopes: Carbon­12, Carbon­13, Carbon­14

Notice how the # of protons does NOT change!

­12

http://education­portal.com/academy/lesson/atomic­number­and­mass­number.html#lesson

Protons and Neutrons

InstructionsBelow you will practice figuring out the different protons, electrons, and neutrons for the table. I have left some open to help you out, but once you have an answer click on the cell shade to reveal the answers. If you need the periodic table click on the animal below 

to go to the periodic table.

Protons and Neutrons

PreviousPrevious NextNext

Isotope Number of p+  Number of e­  Number of no  Nuclear Symbol

Hydrogen­2  1 

Helium­3  2 

Lithium­7  73Li 

Beryllium­9 4 

Boron­11 

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October 15, 2014

Oct 14­4:59 PM

IONS• An atom usually has a neutral charge• That means it has the same number of protons 

as electrons – Remember, a proton has a positive charge and an electron has a negative charge

• ION – an atom that has lost or gained one or more electrons and has become charged either positively or negatively

Oct 14­4:59 PM

Positive Ions: "CATIONS"• When an atom LOSES electrons, it becomes 

more POSITIVE

• You are getting rid of negative particles (electrons) but your number of positive particles (protons) are staying the same.> In other words, you are 

subtracting negative numbers

WHY??

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October 15, 2014

Oct 14­4:59 PM

Negative Ions: "ANIONS"

• When an atom GAINS electrons it becomes more NEGATIVE

• Electrons have a negative charge, so the more you have, the more negative you become

WHY?

Oct 14­4:59 PM

Representing Ions• Ions are represented by placing a “superscript” charge number next to the atomic symbol

• Examples   > O­2 = oxygen with a negative 2 charge

> K+ = potassium with a positive 1 charge

> N­3 = nitrogen with a negative 3 charge

oxygen gains 2 electrons

nitrogen gains 3 electrons

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October 15, 2014

Isotopes

NextNextPreviousPrevious

Oct 14­4:59 PM

EXAMPLE 1:

1.  Neutral Sodium (Na) atoms have ____ protons and ____electrons with a net charge of ______.                           

 2.  If the Sodium ion gives one electron away, what is the net charge of the ion?   ________.                          

3.  What is the chemical symbol for this ion?   ______________

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October 15, 2014

Oct 14­4:59 PM

EXAMPLE 2: 

1.  Neutral Chlorine (Cl) atoms have ____ protons and ____electrons with a net charge of ____.                             2.  If the Chlorine ion gets one extra electron, what is the net charge of the ion?   ______.                                 3.  What is the chemical symbol for this ion?   ______________ 

Oct 14­4:59 PM

Examples

ISOTOPE

ION

134 ION

33 ISOTOPE

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October 15, 2014

Mar 19­7:45 AM

Assignment Instructions

Drag and drop the appropriate amount of subatomic particles to create the assigned atom.  Be sure to note the charge of the atom.

Do not press "restart" when done.  Proceed to the next slide and create that atom.  

Atom 1:  Lithium (+1 ion)

Li 1+7

3

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10

October 15, 2014

Atom 2:  Carbon (neutrally charged)

C12

6

Atom 3:  Oxygen (­2 ion)

O2­16 8

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October 15, 2014

Atom 4:  Magnesium (+2 ion)

Mg 2+ 24 12

Oct 14­4:59 PM