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Question
Write the chemical formula of the following compound in a step-by-step manner –
Sodium bromide
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Solution
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
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