Question

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

Sodium bromide

Answer 1

Write the formula of

Sodium bromide	Symbol	Valency
Sodium	\[\ce{Na}\]	\[\ce1^+\]
Bromide	\[\ce{Br}\]	\[\ce1^-\]

Step I – Write each symbol with its valency.
\[\ce{Na}^{1+}\]  \[\ce{Br}^{1-}\]
Positive ion is written first

Step II – Interchange the valencies and ignore the signs

The Formula is NaBr