Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 11
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286. IONIC FORMULA
LI 7
E
The ionic formula shows the charges of the ions present in an ionic
substance.
The value of the charge on an ion is the same as the valency.
METALS form POSITIVE IONS
NON-METALS form NEGATIVE IONS
GROUP
1
2
3
4
5
6
7
0
NUMBER
VALENCY 1
2
3
4
3
2
1
0
CHARGE
1+
2+
3+
4
3-
2-
1-
0
ON ION
* Group 4 elements do not usually form ions on their own
Example 1 Lithium chloride
Use the previous valency rules as normal
1. Li
Cl
1
1
2. Li
Cl
3. Li
Cl
1
1
4. (Not needed)
5. Li Cl
To obtain the ionic formula another step is needed.
Step6. Add the charges to ions using the table above or the data book in
case of a complex ion. If there is more than 1 of the ion, put the ion and
charge in a bracket.
+
Lithium is a group 1 metal so has a 1
charge. Chlorine is a group 7 non
-
metal so has a 1
charge.
+
-
6. Li
Cl
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