Bonding Basics Worksheet With Answer Key - T. Trimpe Page 2
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1
2Bonding Basics Review
ANSWER KEY
1. Complete the chart using your knowledge of atoms.
Total # of
# of Valence
# of Electrons
Oxidation
Element
Atomic Symbol
Electrons
Electrons
Gained or Lost
Number
Bromine
Br
35
7
Gain 1
1-
Li
3
1
Lose 1
1+
Lithium
Ca
20
2
Lose 2
2+
Calcium
S
16
6
Gain 2
2-
Sulfur
Boron
B
5
3
Lose 3
3+
Silicon
Si
14
4
Gain/Lose 4
4+ 4-
Phosphorus
P
15
5
Gain 3
3-
2. Ionic Bonds - Draw the Lewis structures for each atom, draw arrows to show the transfer of electrons,
write the charge for each ion, and then write the chemical formula.
(A) Potassium + Bromine
(B) Magnesium + Oxygen
(C) Lithium + Nitrogen
Mg
O
Li
K
Br
N
Li
1+
1-
KBr
2+
2-
MgO
K
+ Br
Mg
+ O
1+
1+
1+
3-
Li
+ Li
+ Li
+ N
Li
Li
N
3
3. Covalent Bonds – Draw the Lewis structures for each atom, draw circles to show the electrons that are
shared, and then write the bond structure and chemical formula.
(A) Fluorine + Fluorine
(B) 3 Hydrogen + 1 Phosphorus
(C) 2 Hydrogen + 1 Sulfur
P
S
F
F
H
H
H
H
H
F F
F
2
P
S
H
H
H
H
S
2
H
H
H
P
H
H
3
T. Trimpe 2008
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