Every compound has a specific formula. Elements in the same group of the periodic table form compounds with similar formulae.
Groups the elements from Ratio of atoms in compound Typicial formula
1 & 7 or 2 & 6 1:1 LiF or MgO
2 &7 1:2 MgCl2 (lower case 2)
1 & 6 2:1 K2O (lower case 2)
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