Name: _________________________________ Class: _________ Date: __________
Ions
How many protons, neutrons and electrons are present in each of the following atoms or ions?
Atom/Ion
24
Mg
24
Mg
2+
59 Co 2+
59
Co
3+
59
Co
79
Se
79
Se
2-
63 Ni
59
Ni
2+
Protons Neutrons Electrons
Common Polyatomic Ions
Write the names and charges of these ions/atoms.
1.
Phosphate Ion
2.
Chlorine Atom
3.
Sulfite Ion
4.
Acetate Ion
5.
Sulfur Atom
6.
Carbonate Ion
7.
Nitrate Ion
8.
Chloride Ion
9.
Oxide Ion
10.
Nitride Ion
11.
Sulfate Ion
12.
Sulfide Ion
13.
Ammonium Ion
14.
Nitrite Ion
15.
Chlorate Ion
16.
Hydroxide Ion
17.
Nitrogen Atom
18.
Oxygen Atom
Writing Chemical Formulas
ALL compounds are
Each and every compound has a positive part and a negative part. The positive part comes FIRST and the negative part comes LAST.
Procedure: 1. Write the chemical symbol of the positive part of the compound first and then write the chemical symbol for the negative part of the compound.
2.
Write the charge (oxidation number) for both the positive and the negative part of the compound.
3.
Since all compounds are
, the charges of the chemical formula must be balanced. USE SUBSCRIPTS ONLY!! The total charge of the positive part of the compound MUST EQUAL the total charge of the negative part of the compound so the over all charge is NEUTRAL.
When more than one POLYATOMIC ION is needed—use PARENTHESES. NEVER, EVER, NEVER, use parenthesis with MONATOMIC IONS!!!!!!!!!!

Write the formula for each of the following ionic compounds: a.
Sodium dihydrogen phosphate b.
Lithium nitride c.
Chromium (III) carbonate d.
Tin (II) fluoride e.
Ammonium acetate f.
g.
h.
Ammonium hydrogen sulfate
Cobalt (III) nitrate
Mercury (I) chloride i.
Potassium chlorate j.
Sodium hydride
Write the formula for each of the following covalent compounds: a.
Sulfur difluoride b.
Sulfur hexafluoride
Name each of the following compounds. a.
NaCl b.
RbBr c.
CsF d.
AlI
3 e.
HI f.
H
2
Se g.
NaHSO
4 h.
Ca(HSO
3
)
2 i.
Ru(NO
3
)
3 j.
V
2
O
5
Name each of the following acids/molecular compounds. a.
NO b.
NF
3 c.
N
2
Cl
2
Using the names below give the correct chemical formula.
1.
Ammonium cyanide
2.
Potassium nitrate
3.
Beryllium hydroxide
4.
Cesium permanganate
5.
Boron iodate
6.
Sodium bicarbonate
7.
Rubidium dihydrogen phosphate
8.
Barium hydroxide
9.
Ammonium hydroxide
10.
Sodium chlorate
11.
Strontium chlorate
12.
Sodium nitrate
13.
Barium acetate
14.
Boron bisulfate
15.
Sodium acetate
16.
Rubidium iodate d.
e.
f.
g.
17.
18.
19.
27.
28.
29.
30.
SiF
HNO
HNO
H
3
4
PO
3
2
4
Potassium permanganate
Cesium bicarbonate
Sodium hydroxide
20.
Hydrogen cyanide
21.
Barium bisulfate
22.
Cesium nitrate
23.
Lithium chlorate
24.
Magnesium permanganate
25.
Calcium cyanide
26.
Beryllium acetate
Magnesium bicarbonate
Lithium bisulfate
Potassium iodate
Calcium bicarbonate

Given the chemical formula, write the correct name.
1.
HOH
2.
LiCN
3.
RbNO3
4.
Be(ClO
3
)
2
5.
Ca(MnO
4
)
2
6.
HCH
3
COO
7.
NH
4
HCO
3
8.
Ba(IO
3
)
2
9.
Mg(HSO
4
)
2
10.
Sr(NO
3
)
2
11.
B(CN)
3
12.
Mg(OH)
2
13.
RbMnO
4
14.
Ba(ClO
3
)
2
15.
Sr(CH
3
COO)
2
Tell how many protons, neutrons and electrons are in each atom.
1.
N
2.
Ca
3.
Kr
4.
W
5.
Hg
16.
RbOH
17.
Be(CN)
2
18.
Ca(NO
3
)
2
19.
KClO
3
20.
CsCH
3
COO
21.
KHCO
3
22.
Mg(HSO
4
)
2
23.
LiIO
3
24.
B(H
2
PO
4
)
3
25.
NaH
2
PO
4
26.
Ba(MnO
4
)
2
27.
LiHCO
3
28.
KHSO
4
29.
CsIO
3
30.
NH
4
H
2
PO
4
Give the period and group in which each of these elements is found.
1.
Nitrogen
2.
Sodium
3.
Iodine
4.
Mercury
Tell how many energy levels each atom has and how many electrons are in each level.
1.
N
2.
Ca
3.
Na
4.
Kr
5.
W
6.
Hg
Give the name for each compound given its chemical formula.
1.
KCl
2.
CsCl
3.
Mg
3
P
2
4.
CuBr
5.
NiCl
2
6.
NiF
3
7.
SnF
4
8.
CaCl
2
9.
MnCl
2
10.
AuCl
3

Give the correct formula for the following names.
1.
Iron (II) sulfide
2.
Copper (I) oxide
3.
Iron (III) bromide
4.
Aluminum sulfate
5.
Manganese (II) cyanide
6.
Silver acetate
7.
Iron (III) phosphate
8.
Zinc (II) carbonate
9.
Lithium sulfide
10.
Aluminum nitride
11.
Cesium fluoride
12.
sodium hydroxide
13.
Gallium (I) iodide
14.
Silver bromide
15.
Tin (IV) chloride