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QUESTION

# How can I write the formula for sodium phosphide?

Sodium Phosphide has a formula of Na_3P.

Sodium is a metal cation with a charge of Na^(+1) Phosphorus is a nonmetal anion with a charge of P^(-3)

In order to bond ionically the charges must be equal and opposite. It will take one -3 phosphide ion to balance three +1 sodium ions forming a magnesium phosphide molecule of Na_3P.

I hope this was helpful. SMARTERTEACHER