Bonding Basics Review
Name _____________________________
1. Complete the chart using your knowledge of atoms.
Element
Atomic Symbol
Total # of
Electrons
# of Valence
Electrons
# of Electrons
Gained or Lost
Oxidation
Number
Bromine
Lithium
Calcium
Sulfur
Boron
Silicon
Phosphorus
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 + Iodine
(B) Magnesium + Oxygen
(C) Lithium + Nitrogen
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
T. Trimpe 2008
http://sciencespot.net/
(C) 2 Hydrogen + 1 Sulfur
Bonding Basics Review
ANSWER KEY
1. Complete the chart using your knowledge of atoms.
Atomic Symbol
Total # of
Electrons
# of Valence
Electrons
# of Electrons
Gained or Lost
Oxidation
Number
Bromine
Br
35
7
Gain 1
1-
Lithium
Li
3
1
Lose 1
1+
Calcium
Ca
20
2
Lose 2
2+
Sulfur
S
16
6
Gain 2
2-
Boron
B
5
3
Lose 3
3+
Silicon
Si
14
4
Gain/Lose 4
4+ 4-
Phosphorus
P
15
5
Gain 3
3-
Element
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
K
Br
(B) Magnesium + Oxygen
Mg
(C) Lithium + Nitrogen
O
Li
N
K1+ + Br1-  KBr
Li
Mg2+ + O2-  MgO
Li1+ + Li1+ + Li1+ + N3 Li3N
Li
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
F
F
(B) 3 Hydrogen + 1 Phosphorus
P
H
H
(C) 2 Hydrogen + 1 Sulfur
S
H
H
F F
H
F2
H
P
H
H
T. Trimpe 2008
H
H
H3P
http://sciencespot.net/
S
H
H
H2S