Unit 3 Study Guide
On the test you will only have a periodic table!
Learning Objectives:
1. Students should be able to describe and model how electrons fill orbitals surrounding the nucleus of an atom
and describe the stability of an atom given a periodic table.
2. Students should be able to describe and identify valence electrons and list elements will similar valence shells
given a periodic table.
Questions
1. What is the Aufbau Principle? Describe how it applies to atoms.
2. What is a valence shell?
3. What is a valence electron? How is it different from other electrons?
4. For each of the following atoms:
State how many total electrons each atom has, how many valence electrons it has, how many energy levels it has,
how many valence electrons it has, draw the Lewis Dot structure for the atom
a. N
d. Br
g. Ba
j. Mg
b. Si
e. At
h. K
k. H
c. Cl
f. Rn
i. Rb
l. Ga
5. Write the long electron configurations AND the noble gas notations for each of the following elements:
a. Be
e. Mg
i. Ar
m. Li
b. O
f. H
j. Al
n. P
c. Ne
g. Li
k. N
o. S
d. Ar
h. F
l. Na
p. C
6. Name the element that has each of the following electron configurations:
a. 1s22s22p3
b. 1s22s1
c. 1s22s22p63s1
d. 1s22s22p63s23p6
e. 1s22s22p63s23p2
f. 1s22s22p1
7. What is the octet rule?
8. What makes noble gasses stable?
9. Which of the following electron configurations are associated with stable atoms (are the most stable) and why:
a. 1s22s22p3
b. 1s22s1
c. 1s22s22p63s1
d. 1s22s22p63s23p6
e. 1s22s22p63s23p2
f. 1s22s22p1