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Atomic Atomic ModelModel
ScientistsScientists Nuclear Nuclear ChemChem
ParticlesParticles PotpourriPotpourri
100 100 100 100 100
200 200 200 200 200
300 300 300 300 300
400 400 400 400 400
500 500 500 500 500
Final
100 Atomic ModelAtomic Model
Name the apparatus used to discover the electron
Answer
Atomic ModelAtomic Model 100
Cathode ray tube
200 Atomic ModelAtomic Model
Name the scientist who discovered the electron. Name the atomic model that was a
result of this discovery.
Answer
Atomic ModelAtomic Model 200
J. J. Thomson
Plum Pudding Model
300 Atomic ModelAtomic Model What conclusion can be drawn from
the fact that most of the alpha particles passed straight through the
foil in the Gold Foil Experiment?
Answer
Atomic ModelAtomic Model 300
An atom is mostly empty space.
400 Atomic ModelAtomic Model
What conclusion can be drawn from the fact that a few of the alpha
particles were deflected by (bounced back from) the foil in the Gold Foil
Experiment?
Answer
Atomic ModelAtomic Model 400 Answer
Atoms have a small, dense, positive nucleus.
500 Atomic ModelAtomic Model
Draw and label the Plum Pudding Model.
Answer
Atomic ModelAtomic Model 500 Answer
100 ScientistsScientistsName the scientist who used the
Oil Drop Experiment to determine the charge on an
electron.
Answer
ScientistsScientists100 Answer
Millikan
200 ScientistsScientists
• Describe three of Marie Curie’s unique accomplishments as a scientist.
Answer
Scientists Scientists 200 Answer• Helped discover radioactivity.• Discovered and named two new
elements.• First woman to earn a Nobel Prize.• First person to win 2 Nobels.• Established use of X-Rays in
WWI.
300 ScientistsScientists
Name the discoverer of the neutron.Answer
Scientists Scientists 300
James Chadwick
400 ScientistsScientists
Describe two corrections to Dalton’s 1808 Atomic Theory.
Answer
Scientists Scientists 400 Answer
• Atoms are divisible (they are made of smaller particles)
• Atoms of same element can have different masses (isotopes)
• Atoms can be created and destroyed (nuclear chemistry)
500 ScientistsScientists
Name the scientists credited with the discovery of radioactivity.
Explain how this discovery changed the idea of the “indivisible” atom.
Answer
Scientists Scientists 500 Answer
Henri Becquerel, Marie Curie, Pierre Curie
The fact that something can be emitted from the atom indicated that it must
have subatomic particles.
100 Nuclear ChemNuclear Chem
A 4.00 g sample of Francium-210 decays to a 1.00 g
sample in 5.2 min. What is the t1/2 of this isotope?
Answer
Nuclear ChemNuclear Chem 100 Answer
4.00 g to 2.00 g in one half life
2.00 g decays to 1.00 g in 2nd half life
5.2/2 = 2.6 min= t1/2
200 Nuclear ChemNuclear Chem
• What type of radioactive decay results in energy only being emitted from the nucleus?
Answer
Nuclear ChemNuclear Chem 200
• Gamma decay – emits gamma rays
300 Nuclear ChemNuclear Chem
Write the nuclear chemical equation for the beta decay of
rubidium-90. Answer
Nuclear ChemNuclear Chem 300 Answer
400 Nuclear ChemNuclear Chem
Write the nuclear symbol of the new element produced when
Neptunium-237 (Np) undergoes alpha decay.
Answer
Nuclear ChemNuclear Chem 400 Answer
500 Nuclear ChemNuclear Chem
What scientist discovered the nucleus of the atom and later the
proton?Name and label the new model generated from this discovery.
Answer
Nuclear ChemNuclear Chem 500
Ernest Rutherford Planetary Model
electron in orbit
dense, positive nucleus
empty space
100 Particles Particles
Name the particle that has about the same mass as a proton but no
electric charge.
Answer
ParticlesParticles 100 Answer
Neutron
200 ParticlesParticles
Write the complete nuclear symbol for the particle that has
48 protons64 neutrons46 electrons
Answer
ParticlesParticles 200 Answer
300 ParticlesParticles
Give the number of protons, neutrons and electrons in
potassium-40.
Answer
ParticlesParticles 300 Answer
19 protons
21 neutrons
19 electrons
400 ParticlesParticles
Give the number of protons neutrons and electrons for the most abundant isotope
of B3-
Answer
ParticlesParticles 400
5 protons
6 neutrons
8 electrons
500 ParticlesParticles Name the force which holds together the particles in the
nucleus.Explain why it is strange to us.
Answer
ParticlesParticles 500
Nuclear ForceIt is strange because like charges usually repel, yet many positive charges are
held together in small space.
100 PotpourriFor the Electron Cloud Model, name the scientist credited with its discovery and explain the many tiny dots.Answer
Potpourri 100
Schrodinger
Dots represent probability of locating an electron in a particular region. Where
the dots are densest, an electron is more likely to be found. Where there are
few or no dots, an electron is unlikely.
200 Potpourri
Give two reasons why the Bohr Model is invalid.
Answer
Answers for Potpourri 200
1. It is impossible to predict a specific location and momentum (energy)
for an electron. (Heisenberg Uncertainty Principle)
2. The math does not correspond to data for any atom other than H
(one electron)
300 Potpourri
Name the two main regions of the atom.
Which region occupies most of the volume of the atom?
Which region has most of the atom’s mass?Answer
Potpourri 300
• The two regions are the nucleus and the electron cloud.
• The electron cloud constitutes most of the volume of the atom and is mostly empty space.
• The nucleus contains most of the atom’s mass.
400 Potpourri
A reaction between 46 g of sodium and 71g of chlorine will produce how much salt (NaCl)?
Answer
Potpourri 400 Answer
117 g (Law of Conservation of Mass)
500 Potpourri
Give chemical formulas of two compounds which support the Law
of Multiple Proportions.
Answer
Potpourri 500 Answer
• CO2 and CO
• Also, N2O and N2O4
• (Same elements can combine in different whole
number ratios to form different compounds)
Final Jeopardy
Draw and explain the Indivisible Atom Model.
Who first described this model?
Answer
Final Jeopardy Answer
It is a solid sphere with no smaller parts inside.
First proposed by Democritus (Greeks) 400 BC
