Question

Write the chemical formula of the following compound in a step-by-step manner –

Magnesium nitride

Answer 1

Write the formula of

Magnesium nitride	Symbol	Valency
Magnesium	\[\ce{Mg}\]	\[\ce{2^{+}}\]
Nitride	\[\ce{N}\]	\[\ce{3^{-}}\]

Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Mg}^{2+}\]  \[\ce{N}^{3-}\]
Step II – Interchange the valencies positive ion is written first.

The Formula is \[\ce{Mg3N2}\]