State three rules for writing the chemical formulae.
(N/A) $(1)$ The valencies or charges on the ions must be balanced.
$(2)$ When a compound consists of a metal and a non-metal,the name or symbol of the metal is written first.
$(3)$ In compounds formed with polyatomic ions,the ion is enclosed in a bracket before writing the number to indicate the ratio. In case the number of the polyatomic ion is one,the bracket is not required.
$(2)$ When a compound consists of a metal and a non-metal,the name or symbol of the metal is written first.
$(3)$ In compounds formed with polyatomic ions,the ion is enclosed in a bracket before writing the number to indicate the ratio. In case the number of the polyatomic ion is one,the bracket is not required.
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