P^2+Σ2P is the pattern of prime numbers which move like atom.
This is Carbon.
There are 6 electrons.
Σ is hybrid, and atomic orbitals are mixtures. Then, you see sp^3.
You move one electron in 2S to 2P. This is called promotion. 2S lose one electron.
There are 4 hydrogen atoms.
This is tetrahedron and sp^3. Methane is CH4.
In sp^2 hybridisation, 2S move to 2P.
This is triangle and sp^2. Ethylen is C2H4 which is the double bond.