Discuss the reactivity of group-$15$ elements with metals.

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(N/A) All group-$15$ elements react with metals to form their binary compounds,in which they exhibit an oxidation state of $-3$. Examples include $Ca_{3}N_{2}$ (calcium nitride),$Ca_{3}P_{2}$ (calcium phosphide),$Na_{3}As$ (sodium arsenide),$Zn_{3}Sb_{2}$ (zinc antimonide),and $Mg_{3}Bi_{2}$ (magnesium bismuthide).

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