Question

Number of electrons in the penultimate and ultimate shell of copper​

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.

calcium is the element with equal number of electrons in its ultimate and penultimate shell

Explanation:

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Answer 2

Answer:

18

Explanation:

Penultimate shell is the shell just before the valence or the ultimate shell . i.e., the second last shell of the atom.For copper 2, 8, 18, 1