Which of the following is not a hydrogen-like species?

Regarding the two isotopes $_{13}Al^{27}$ and $_{14}Si^{27}$,which of the following statements is correct?

The mass number of an anion,$X^{3-}$,is $14$. If there are $10$ electrons in the anion,the number of neutrons in the nucleus of an atom of the element $X$ is:

The number of protons,neutrons and electrons in ${ }_{71}^{175} Lu$,respectively,are:

Nucleons are equal to :

Isotopes are those which contain