p - character in sp2 hybridization is:
Here:
1s orbital + 1p orbital ⇒ 2 sp hybrid orbitals
1s orbital + 2p orbital ⇒ 3 sp2 hybrid orbitals
1s orbital + 3p orbital ⇒ 4 sp3 orbital (hybrid)
So, whenever we are get sp2 hybridization, we get three sp2 hybrid orbitals.
p - charcter = Numberofp−orbital involved in hybridizationNumber of hybrid orbitals
p - charcter = 23