Formal charge of NO2- || Formal charge of Nitrite ion

Formal charge can be calculated using the formula,
FC= VE- (LP+ BP/2)
VE-  valence electrons
LP- Lone pair electrons
BP- Bond pair electrons
It helps to identify best structure from possible Lewis structure.
To draw Lewis structure, Please watch these videos

Draw Lewis structure of HCOOH ( Formi...
( How to draw Lewis structure for HCOOH)

Lewis structure of H2S || Electron do...
( H2S - a simple compound, Learn to draw Lewis structure correctly)

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