Question

What is penultimate shells and antipenultimate shells?

Answer 1

hi friend,


in an atom, the electrons enter into various shells ...the shell in which the differentiating electron enters is called valence shell and the shell which lies inside the valence shell is called penultimate shell and the shell which lies inside the penultimate shell is called antipenultimate shell




I hope this will help u :)

Answer 2

Penultimate shell
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The shell which is before the valence shell is called penultimate shell. If 'n' is the valence shell then (n-1) is the penultimate shell. Transition elements contain unpaired electrons in penultimate shells.

Anti-Penultimate shell
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Shell inner to penultimate shell are known as anti- penultimate shells.

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