Element Name
Fe
Cu
Ar
Mn+3
Ca+2
P-3
S-2
Cl-1
Protons
Neutrons
Electrons
Element Name
Protons
Neutrons
Electrons
Fe
26
56-26 = 30
26
Cu
29
64-29 = 35
29
Ar
18
40-18 = 22
18
Mn+3
25
56-25 = 31
22
Ca+2
20
40-20 = 20
18
P-3
15
31-15 = 30
18
S-2
16
32-16 = 20
18
Cl-1
17
36-17 = 19
18
Ionic Compounds
NaCl
1. Write down the name of the metal which is the first
symbol in the chemical formula. Note: in a chemical
formula you can identify each element because they
always start with a capital letter.
Na = sodium
2.
Write down the name of the non metal immediately
after the metal. Note: you must change the ending
of the non metal to ide. For example oxygen = oxide,
fluorine = fluoride.
NaCl = sodium chloride
Write the chemical names for the following compounds
BaO
MgS
CaCl2
Barium oxide
Magnesium
sulphide
Calcium
Chloride
Magnesium fluoride
1.
Write down the chemical symbol for the metal element.
Magnesium = Mg
2.
Find the valence/oxidation number/charge and write the
number above the elements symbol.
2
Mg
3.
Write the chemical symbol for the non metal and
place the elements valence/oxidation number/charge
above it.
1
F
At this point you should have on your page
2
Mg
1
F
Remember that the net charge between the Cation
(positive ion) and the Anion (negative ion) has to be
Zero. You need to figure out how many of each ion you
will need to make the charges cancel.
Cation + Anion
+2
-1
Mg + F
1(+2)
+ 2(-1)
= 0
=0
Sodium oxide
+1 + (-2)
Na
O
(+1) + (-2) = 0
2(+1) + 1(-2) = 0
Na2O
Barium chloride
Aluminum sulphide Magnesium oxide
Write the chemical formulae for the following
compounds.
Sodium oxide
Na2O
Barium chloride
BaCl2
Aluminum sulphide
Al2S3
Magnesium oxide
MgO