State the difference between a shell and subshell present in an atom

 In an atom, a shell is a principal energy level that contains electrons moving at a similar average distance from the nucleus. Shells are labeled with integers (n = 1, 2, 3, ...), and each shell can contain one or more subshells.

A subshell is a set of orbitals within a given shell, and it is designated by a letter (s, p, d, f). Each subshell can hold a specific number of electrons. The s subshell has one orbital, the p subshell has three orbitals, the d subshell has five orbitals, and the f subshell has seven orbitals.

In summary, a shell is a broader energy level, while a subshell is a subset of that level, consisting of specific orbitals with distinct shapes and orientations.

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