Question

define penultimate shell​

Answer 1

Answer:

Penultimate shell is the shell which is filled just before the valence shell i.e. the shell just inner to valence shell. It will have a number one less than valence shell. If the valence shell has value 'n' then the penultimate shell will have value (n-1).

Answer 2

Answer:

Penultimate shell is the shell which is filled just before the valence shell i.e. the shell just inner to valence shell. It will have a number one less than valence shell. If the valence shell has value 'n' then the penultimate shell will have value (n-1).