Question

Halogens are diatomic or monoatomic?

On solving the hybridization part , we should consider halogens as diatomic or monoatomic?

Hybridization=1\2(V+M-C+A)

V=No.of valence electrons
M=No.of monoatomic atoms
C=No.of cations
A=No.of anions

Answer 1

They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group thehalogens become less reactive. The elements in group 0 are known as noble gases. They are very unreactive and exist as individual atoms (monatomic).
Once again, as in the case for hydrogen the halogens (fluorine, chlorine, bromine, and iodine) will only bond to one other atom in organic molecules. Therefore, we do not have to worry about the geometry around halogen atoms. As shown in the molecules below (both examples of chlorofluorocarbons or CFC's), halogen atoms can take the place of hydrogen atoms in organic molecules