Writing Ionic Compounds Formulas | Fast & Easy Way | Practice Examples | Chemistry

Science 9 - Unit B: Matter & Chemical Changes
4 simple steps to write formulas for ionic compounds with practice examples.

Step 1: Write down the metal ion first with its charge.
Step 2: Write down the non-metal ion second with its charge.
Step 3: Keep adding either metal ions or non-metal ions until the positive and negative charges balances out, they must add up to zero.
Step 4: Count the number of ions of each element. Put the number as a subscript to the right of the ion symbol and remove the ion charge.
*Note: the number “1” is invisible

Answer for practice questions:
SnF₂
AlPO₄
CaS
LiBr
BeF₂

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