Bonding regions of central atom is given by the number of bonds surrounding the central atom i.e., number of bonds attached with the central atom.
1. H2 --- One single bond is present between two hydrogen atoms. So bonding region is 1.
2. F2 --- One single bond is present between two fluorine atoms. So bonding region is 1.
3. H2O --- Central atom is Oxygen. It is bonded with 2 hydrogen atoms. So bonding regions are 2.
4. N2 --- One triple bond is present between two N atoms. So bonding region is 1.
Lone pairs are calculated from valency electronic configuration of central atom.
1.H :1e-: 1s1 --- Lone pairs=0.
2.F : 9e-: 1s2 ] 2s2 2p5 :
--- Number of Lone pairs = 3
3.O: 8e-: 1s2 ] 2s2 2p4 :
--- Number of Lone pairs = 2
4.N: 7e-: 1s2 ] 2s2 2p3 :
--- Number of Lone pairs =1
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