Group IA Group IIA Group IIIA Group IVA 5 Steps to write Chemical Formulas Group VA Magnesium. Group VIA Group VIIA Chlorine 1. Write the symbols of the elements. 2.Write their oxidation numbers as superscript. 3.Drop the charges. 4.Criss-cross the oxidation numbers (Superscript to become subscript) 5.Reduce the numbers to the simplest ratio. Group IA Group IIA Group IIIA Group IVA 5 Steps to write Chemical Formulas 1. Write the symbols of the elements. 2.Write their oxidation numbers as superscript. 3.Drop the charges. 4.Criss-cross the oxidation numbers (Superscript to become subscript) 5.Reduce the numbers to the simplest ratio. Group VA Magnesium. Group VIA Chlorine Group VIIA
