1. 1. The number of electrons a single d orbital
can hold is
a. 10 b. 6 c. 2 d. 14
2. How many d electrons can the second
energy level hold?
a. 0 b. 2 c. 6 d. 10
3. The number of s electrons in a single
oxygen atom is
a. 0 b. 2 c. 4 d. 6
1s22s22p4

2. 4. What is the total number of orbitals
containing electrons in a nitrogen atom?
a. 5 b. 3 c. 4 d. 6
5. Of the orbitals shown, the one with the
lowest energy is
a. 2s b. 3s c. 3d d. 2p
6. The maximum number of electrons that
can occupy a 3p sublevel.
a. 1 b. 2 c. 3 d. 6

3. 7. The electron configuration of an atom is
1s22s22p63s23p3. The atomic number of
the atom is
a. 15 b. 11 c. 5 d. 3
8. The electron configuration of an atom is
1s22s22p63s23p6. The number of unpaired
electrons in this atom are
a. 2 b. 3 c. 5 d. no correct answer given
9. The electron configuration of an atom is
1s22s22p63s23p6. The number of orbitals
occupied by electrons is
a. 5 b. 9 c. 11 d. 15

4. 10. The maximum number of electrons in the 4d sublevel is
a. 2 b. 6 c. 8 d. 10
11. Which is the electron configuration of
atomic number 18?
a. 1s22s22p63s23p2 c. 1s22s22p63s23p44s2
b. 1s22s22p63s23p6 d. 1s22s22p63s23p64s2
12. The correct electron sublevel structure
for 25Mn is?
1s22s22p63s63d b. 1s22s22p63s23p64s24p5
1s22s22p63s23p64s24p5
1s22s22p63s23p64s23d5

5. 13. [Ar] 4s23d2 is the electron configuration
for
a. Scandium b. Titanium
c. Vanadium d. Zirconium
14. [Kr] 5s24d10 is the electron configuration
for
a. Br b. I c. At d. Cd

6. 15. Which atom does not have an unpaired
electron in its ground-state electron
structure?
C b. Ca c. P d. Cl
2s22p2 4s2 3s23p3 3s23p5
16. Which of the waves is not part of the
electromagnetic spectrum?
a. X-rays b. microwaves
c. sound waves d. red light

7. 17. Regions of space around the nucleus of an
atom that can be occupied by one or two
electrons with identical energy are called
a. shells b. energy levels
c. photons d. orbitals
18. The first energy level which has f orbitals to fill is
a. 2 b. 3 c. 4 d. 5
19. Members of oxygen’s family on the periodic
table have electron configurations which end
with
a. ns2 b. ns2np1 c. ns2np2 d. ns2np4

8. 20.Which element has the fewest energy levels? a. F b. Mg c. He d. Co
Use the following spectra to answer Questions # 21 – 24
R O Y G B I V
F l ll l l l llll
Mg ll ll l l l l
Co l l l l l l
He l l l l l
20.Which element has the fewest energy
levels?
a. F b. Mg c. He d. Co
21. Which element has energy levels with
more transitions of low energy?
a. F b. Mg c. He d. Co

9. 22. Which element has more levels in the “excited state”?
Use the following spectra to answer Questions # 21 – 24
R O Y G B I V
F l ll l l l llll
Mg ll ll l l l l
Co l l l l l l
He l l l l l
22. Which element has more levels in the
“excited state”?
a. F b. Mg c. He d. Co
23. Which element has electrons releasing
the most photons of light of medium energy?
a. F b. Mg c. He d. Co

10. c = (wavelength)(frequency)
c = 3.00 x 108 m/s
24. What is the wavelength of photons of
light of frequency = 1150 kilocycles/sec?
a. 26 m b. 3.4 x 1011 m
c. 261 m d. 3.4 x 1014 m
λ = c v
= x 108 m/s
1.15 x 106 s-1
λ = x 102 m

11. c = (wavelength)(frequency)
c = 3.00 x 108 m/s
25. What is the frequency ( in 1/s) of light
with wavelength equal to 5 x 10-6 cm?
6 x b. 6 x 1014
c. 1.5 x1015 d. 1.5 x103
v = c λ
= x 108 m/s
5 x 10-8 m
v = .6 x 1016 s-1 = 6 x 1015 s-1