Essential Chemistry for IGCSE - Formulae And Equations (Section 2 - No. 14)
What are the key features when writing the formula of an ionic compound?
The metal is always written first
The non-metal is always written first
The number of atoms of each element can be determined by their valencies
The number of atoms must be equal
Explanation
When writing an ionic compound, the metal must always come first, and the number of each element is determined by their valencies.
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