Quiz #1
Name _________________
Please show all of your work or you will not receive full credit.
Date __________
1. Name all three sub-atomic particles and their charges.
1.
2.
3.
2. Where are these subatomic particles located in the atom? (Draw a diagram and label them)
3. a. The elemental symbol for xenon is __________________
b. The atomic number for xenon is ____________________
c. The number of protons in any xenon atom is __________
d. The number of electrons in a neutral xenon atom _____________
5. An isotope is a pair of atoms of the same element with different numbers of
a. electrons
b. protons
c. neutrons
d. atomic numbers
6. 511B has ____ neutrons and ____ electrons. (Assuming the atom is neutral).
a. 11, 5
b. 6, 5
c. 6, 11
d. 22, 10
7. In general, how would you predict which isotope is the most commonly found isotope of an
element based on the average atomic mass you see on the periodic table`?
7. Gallium has two stable isotopes. One of the stable isotopes is Gallium-69 ( or 69Ga, whichever
way you would like to see it written, they mean the same thing!). Gallium-69 has a mass
number of 69 and is 60.11% abundant. The other stable isotope is Gallium-71. Gallium-71 is
30.89% abundant.
Isotope
Gallium – 69
Gallium – 71
Mass Number
69
71
Percent Abundance
60.11%
30.89%
a. Set up the equation that you would use to go about solving for the average atomic mass
of Gallium. Since you do not have a calculator, there is no need to plug this number in. I
just want to see your work.
8. The scientist who discovered the electron was named ____________ . He discovered
negative charge within the atom during his cathode ray experiment, and so he came up with
the ________________ of the atom.
a.
b.
c.
d.
John Dalton, the plum pudding model
Ernest Rutherford, the Bohr Model
J.J. Thomson, the plum pudding model
Neils Bohr, the quantum model