Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 7
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28Example 3. Manganese(IV)oxide
1. Mn
O
4
2
2. Mn
O
3. Mn
O
2
4
4. Mn
O
1
2
5. MnO
2
LI 5
4. PREFIXES
In the names of some compounds the ratio of atoms present can be
indicated by prefixes.
If no prefix is given then it is assumed that only one atom of that
element is present
Prefix
Meaning
Mono
1
Di
2
Tri
3
Tetra
4
Penta
5
Hexa
6
AS SOON AS YOU SEE A PREFIX ANYWHERE IN THE
NAME OF A COMPOUND DO NOT USE CROSS VALENCY
METHOD AND NEVER CANCEL DOWN RATIOS !
7
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