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Name ________________
Honors Chemistry
___/___/___
Part I: Match the name on the right with the correct statement on the left. You will use some names more
than once.
1. __________ His model of the atom is the Electron Cloud Model.
A. Chadwick
2. __________ He discovered the nucleus.
B. Millikan
3. __________ He put electrons into energy levels.
C. de Broglie
4. __________ He developed the uncertainty principle.
D. Heisenberg
5. __________ He said atoms of different elements have different properties.
E. Planck
6. __________ He believed that matter is continuous.
F. Einstein
7. __________ He discovered the electron.
G. Thomson
8. __________ He discovered that the atom is mostly empty space.
H. Schrödinger
9. __________ He used math to explain the location and energy of the electrons in an atom.
I. Stoney
10. __________ He discovered the wave nature of the electron.
J. Rutherford
11. __________ His model is called the quantum mechanics model.
K. Democritus
12. __________ He discovered the neutron.
L. Dalton
13. __________ He used polonium and gold foil in his famous experiment.
M. Bohr
14. __________ He used a cathode ray tube to make his discovery.
N. Aristotle
15. __________ He used the term “atomos” to describe an indivisible part at the base of all matter.
16. __________ He is the Father of the Atomic Theory.
17. __________ He designed a mathematical equation for the model of the atom.
18. __________ He determined the charge of the electron.
19. __________ He deduced the relationship between the energy and frequency of radiation.
20. __________ He proposed that light could be described as quanta of energy that behave as particles.
Part II: Fill in all missing information.
Isotope
#p
#n
#e-
mass #
atomic #
2
1
symbol
europium-151
202
60
157
Hg
146
102
Part III: Calculate the atomic mass.
1. The element boron is found to contain two naturally occurring isotopes. One isotope, boron-10, has a mass of
10.012937 amu and the other, boron-11, has a mass of 11.009305 amu. Determine the percent abundance of each
isotope. Your answer must have four significant digits. You must show all work.
2. Determine the average atomic weight of zinc, given the following isotopes, their masses, and their abundances.
You must show all of your work.
Isotope
Zinc-64
Zinc-66
Zinc-67
Zinc-68
Zinc-70
Mass
63.929
65.926
66.927
67.924
69.925
Abundance
48.63
27.90
4.10
18.75
0.62