what are sub shells ?? Who discovered them and how ??? the discoverer of sub shells disproved which scientist

A subshell is an energy sublevel which is a part of the main shell. For example, the first (K) shell has one subshell, called 1s; the second (L) shell has two subshells, called 2s and 2p and so on. The shell terminology was given by Arnold Sommerfeld. It was a modification to Bohr's model. 

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