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Formulas of oxide and chloride of an ele...

Formulas of oxide and chloride of an element M is `M_(2)O_(3)& MCl_(3)` respectively. State the group to which the element belongs to. Determine whether it is a metal or non-metal.

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Valency of the element M is 5 when oxygen is considered as the standard where as valency of M is 3 when chlorine is considered as the standar. Since, oxygen based valency of an element is equal to its group number, the group to which M belongs is VA(15). element M is a non-metal as it is located in group VA of the periodic table.
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