Question

the outermost s orbital of an atom contains two electrons. always true sometimes true never true

Explanation:

In the periodic table, for example, magnesium (\(Mg\)) has the electron configuration \([Ne]3s^{2}\), where the outermost \(s\) orbital (\(3s\)) has 2 electrons. But hydrogen (\(H\)) has the electron configuration \(1s^{1}\), where the outermost \(s\) orbital (\(1s\)) has 1 electron. So it is not always the case that the outermost \(s\) orbital of an atom contains two electrons.

Answer:

Sometimes true