Question

Help me to understand sp2 vs sp3 hybridisation?

Answer 1

This will probably help:
http://dl.clackamas.edu/ch106-02/typesof.htm

Answer 2

haha. this "hybridization" is not a biological one but a chemical (atomic) one.

Answer 3

(1) s atomic orbital + (3) p atomic orbitals = (4) sp^3 atomic orbitals

forms tetrahedral shape

(1) s atomic orbital + (2) p atomic orbitals = (3) sp^2 atomic orbitals

forms trigonal planar shape