Chemistry Unit 4 Test Review
Electron Configuration
1. What are shapes of s, p, and d subshell?
2. Where are the s, p, d, and f subshell located on the periodic table?
3. How many electrons are needed to completely fill the following energy levels?
a. 1st energy level
b. 2nd energy level
c. 3rd energy level
4. Which one of the three rules explains why electrons have opposite spins?
5. Which rule tells us that one electron must fill each orbital before pairing up?
6. Which rule explains why we must fill lowest energy levels first?
7. Complete the orbital notation, electron configuration, and noble gas configuration for the following
element at ground state.
a. Ca
b. P
c. Cr
Chemistry Unit 4 Test Review
8. Which of the following is the best representation of electrons in an atom at ground state?
a.
b.
c.
d.
↑↓ ↑↓
↑↓ ↑↓ ↑↓
↑↓
↑↑ ↑ ↑
1𝑠 2𝑠
2𝑝
3𝑠
3𝑝
↑↓ ↑↓
↑↓ ↑↓ ↑↓
↑↓
↑↓ ↑↓
1𝑠 2𝑠
2𝑝
3𝑠
3𝑝
↑↓ ↑↓
↑↓ ↑↓ ↑↓
↑↓
↑↓ ↑ ↑
1𝑠 2𝑠
2𝑝
3𝑠
3𝑝
↑↓ ↑↓
↑↓ ↑↓ ↑↓
↑
↑↓ ↑↓ ↑
1𝑠 2𝑠
2𝑝
3𝑠
3𝑝
9. Which of the following electron configurations (there are 2) are possible at ground state?
a. 1s2 2s1 2p6
b. 1s2 2s2 2p5
c. 1s2 2s2 2p4 3s2
d. 1s2 2s2 2p6 3s2
Lewis Dot Structures
10. What is used to draw the Lewis Dot structure?
11. Draw a Lewis diagram for the following compounds and element. Determine the shape if the
compound is covalent.
CaCl2
Type of Compound:_________________
SiH2S
Type of Compound:_________________
CCl4
Type of Compound:_________________
AlI3
Type of Compound:_________________
Chemistry Unit 4 Test Review
Si
Valence e-:____________
O
Valence e-:____________
B
Valence e-:____________
Molecular Geometry
12. How does VSEPR theory explain the shape a molecule will have?
13. Complete the following table.
Number Of Bonds
Number Of Lone Pairs
Shape
Linear
2
3
Central Atom Group
No.
Not applicable
2
0
Trigonal Pyramidal
Tetrahedral
Types of Chemical Bonds
14. How does the sea of electron model for metallic bonding explain conductivity?
15. How does the sea of electron model for metallic bonding explain malleability and ductility of
metals?
16. What is the term that means a metal can be drawn (stretched) into a wire?
17. What is the term for the property of metal that allows it to be hammered or rolled into a thin sheet?
Chemistry Unit 4 Test Review
18. Use what you have learned about metals and the type of ions they form to determine if they have
a higher or lower electronegativity than non-metals.
19. How can we use electronegativity to determine the types of chemical bonds?
20. What types of bonds will the following atoms form? Use electronegativity to explain your answer.
Element
Potassium
Oxygen
Chlorine
Electronegativity
0.82
3.44
3.16
a. Potassium and Chlorine
b. Oxygen and Chlorine
21. Identify the following elements from the electron configuration or noble gas configuration given
below then determine the number of valence electrons.
Configuration
a. 1s2
b. 1s22s22p63s1
c. 1s22s22p63s23p5
d. 1s22s22p63s23p54s23d6
e. [Ne]3s23p1
f. [He]2s22p4
g. [Ar]4s1
h. [Kr]5s24d105s7
Element
Valence electrons