Answer:
1, 2, 0, 1
Explanation:
The bonds between atoms can be explained in terms of hybrid orbitals. The kind of hybrid orbital depends on the kind and number of atomic orbitals that hybridize.
In order to produce sp² hybrid orbitals, 1 s atomic orbital, 2 p atomic orbitals, and 0 d atomic orbitals must be mixed/hybridized.
There are 3 p orbitals in each p sublevel.
After the hybridization, there is 1 unhybridized p orbital around the central atom.