Question

which of the following has same number of electron in outermost shell or penalty mate shell ?

a)Al^3+
b)Ca^2+
c)F^-
d)N^3-
$a. \: \: {al}^{3 + } \\ b. \: \: {ca}^{2 + } \\ c. \: \: {f}^{ - } \\ d. \: \: {n}^{3 + }$

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Answer 1

Al and F have the same no. of electons in their penultimate shell

Ca and N have the same no. of electons in their penultimate shell