Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 6
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283. ROMAN NUMERALS
LI 4
Some elements, particularly the transition metals in the centre block of
the periodic table can have more than one valency. Roman numerals are
often used to show the valency for these elements.
Roman Numeral
Valency
I
1
II
2
III
3
IV
4
V
5
VI
6
We then follow the same set of valency rules as before.
Example 1. Copper(II) chloride
1. Cu
Cl
2
1
2. Cu
Cl
3. Cu
Cl
1
2
4. (Not needed)
5. CuCl
2
Example 2. Iron(III)fluoride
1. Fe
F
3
1
2. Fe
F
3. Fe
F
1
3
4. (Not needed)
5. FeF
3
6
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