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In compounds, representative elements show O.N.

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+1 and +2 mainly

-1 to +5 only

-1 to -7

-4 to 7

answer is D.

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$Examples : \overset{+ 1}{{Na}_{2} O}, \overset{+ 2}{MgO}, \overset{+ 3}{{AlCl}_{3}}, \overset{+ 4}{{CCl}_{4}}, \overset{+ 5}{{PCl}_{5}}, \overset{+ 6}{{SO}_{3}}, \overset{+ 7}{{Cl}_{2} O_{7}}, \overset{+ 7}{{HClO}_{4}}, \overset{- 1}{HCl}, etc .$

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