Question

what is the difference between valence shell and penultimate shell?

Answer 1

Valence shell is the last or outermost shell of an element. Penultimate shell is the second outermost shell or the second last shell of an element.

Answer 2

HELLLO MY FRND..


Penultimate shell is the second last shell in the orbit arrangement of an atom, while the valence shell is the last shell in an atom.
________
thank you