Science 9
Counting Atoms
NAME ________________________
Na
= 1 Na
H2
=2H
Mg3(PS4)2 = 3 Mg, 2 P and 8 S
2 H2Se = 4 H and 2 Se
HBr
Type of atom
4 MgBr2
Type of atom
# of atoms
Total
Na2CO3
Type of atom
# of atoms
Total
# of atoms
Ca3(PO4)2
Type of atom
# of atoms
Total
Total
H2O
Type of atom
# of atoms
3 Pb(NO3)2
Type of atom
# of atoms
Total
Total
LiOH
Type of atom
# of atoms
 Represent a compound that
has three atoms of carbon
and eight atoms of hydrogen.
Total
S 3N 2
Type of atom
Also ….
# of atoms
_________________________
Total
2 NaCl
Type of atom
Total
# of atoms
 Represent three compounds
with each having two atoms
of calcium and one atom of
sulfur.
_________________________