Question

Number of electrons in penultimate shell are same is
(A) Crv
(B) Cu, Zn
(C) Ni, Co
(D) Be. Ca
A
B​

Answer 1

Answer:

Penultimate shell may contain eight or nine electrons and pre-penultimate shell contains more than 18 up to 32 electrons. enultimate shell means the 2nd last shell in which electrons are filled in an atomic orbital.

Answer 2

Answer:

c

plz my channel on YouTube my channel name is technical World with bj