Question

What is S P D etc. method of placing electrons in the orbit shell?

Answer 1

A subshell is a subdivision of electron shells separated by electron orbitals. Subshells are labelled s, p, d, and f in an electron configuration.

Subshell Examples

Here is a chart of subshells, their names, and the number of electrons they can hold:

Subshell	ℓ	Maximum Electrons	Shells Containing It	Name
s	0	2	every shell	sharp
p	1	6	2nd and higher	principal
d	2	10	3rd and higher	diffuse
f	3	14	4th and higher	fundamental

For example, the first electron shell is the 1s subshell.The second shell of electrons contains the 2s and 2p subshells.

Relating Shells, Subshells, and Orbitals

Each atom has an electron shell, which is labelled K, L, M, N, O, P, Q or 1, 2, 3, 4, 5, 6, 7, moving from the shell closest to the atomic nucleus and moving outward. Electrons in outer shells have higher average energy than those in inner shells.

Each shell consists of one or more subshells. Each subshells is composed of atomic orbitals.