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4. For transition metals (copper, iron, lead, tin, etc), they have more than 1 charge. The charges are indicated by roman numerals in brackets after the name of the cation.
e.g. iron(II) chloride, iron(III) oxide

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3. For the name of the compound, cations come first before anions. (metals before non-metals)

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2. Ratio of the number of ions must be in the simplest form (smallest ratio)

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1.  The charges must be balanced (positive and negative charges)

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one must be metal and one must be non-metal.

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The formula must be in the simplest ratio.

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they must have the same charge.

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Must be one positive and one negative charge.

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Charges must be neutral.

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must balance the charges

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one negative charge one positive charge

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both elements must have the same number of charges and balance (e.g +2 and -2)

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the bonding must have a neutral charge

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one must be -ve and one must be +ve.

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The first must be a metal, followed by a non-metal.

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must at least have one +ve and one -ve to balance the charges.

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To balance the charges
Must be a positive and a negative charge