1. Total number of electron paire = 1/2 (number of valence electrons ± electron (for ionic charge)
2. Number of bond electron pairs = number of atoms - 1
3. Number of electron pairs around central atom = total mumber of electron pairs - 3 [number atoms (except H)
4. Number lone pair = (number of central electron pairs - number bond pairs)
 Read the above method and answer the following questions