The Se (selenium) would be sp3d hybridized.
A PH3 molecule has a triangular pyramidal shape. The central atom is the Phosphorus atom, which is connected to three Hydrogen atoms.
CARBON
The water molecule is one oxygen atom connected to two separate hydrogen atoms. The three are not in a perfect straight line, though there is symmetry through the central oxygen atom.
I'm not really sure if it's called a HUB, but I do know that the central core of an atom is called the nucleus, and is made out of protons (with a positive charge) and neutrons (with no charge).
The "dense" central portion of an atom is called the nucleus. The nucleus of an atom contains neutrons and protons.
Sp2,120 is the hybridization of the central atom in SO2.
sp3d hybridization
Carbon, the central atom, is sp2 hybridized.
The central atom in H2S is sp3 hybridized
In H2O, the central atom is Oxygen atom and it is sp3 hybridised
The hybridization is sp3 as its electron geometry is tetrahedral.
It depends on the hybridization of the central atom.
sp2
sp3d
sp3
sp3d2
sp3