Electron Configurations
Advanced Chemistry 2013 – 2014
Name:
Block:
1. Which electrons on an atom are considered valence electrons? (Give a brief answer!)
2. Determine how many valence electrons are found in each of the following elements and ions.
a. C
f. Ca2+
k. P
b. F
g. O
l. Cl-
c. Na
h. Cl
m. S2-
d. He
i. Ne
n. N3-
e. S
j. N
o. Na+
3. For main group elements (i.e. not transition metals), how many valence electrons are present
in cations? In anions?
4. Name each of the following elemental species, then write the full electron configuration for
the ground state of each species:
a. Li
b. Ca
c. I
d. Fe
e. Ta
f. Bk
g. Pd
h. Cli. Na+
5. Name each of the following elemental species, then write the shorthand (abbreviated) electron
configuration for the ground state of each species:
a. Ar
b. K
c. Sr
d. C
e. If. V5+
6. Match each electron configuration or atomic number (Z) in Column 1 with a description in
Column 2. All of the elements in Column 1 are neutral.
Column 1
Column 2
1s22s22p2
has 3 electrons
1s22s1
has 4 principal energy levels
1s22s22p63s23d104s2
atomic number = 6
Z = 18
has 3 unpaired electrons
1s22s22p63s23p1
is a noble gas
Z=7
has 3 valence electrons
7. Determine the element for each of the following orbital populations. Write the atomic symbol.