The nuclei of a tritium $({^3H})$ atom contain how many neutrons?

Which of the following particles has more electrons than neutrons?

The number of protons,electrons and neutrons in a species are equal to $17$,$18$ and $18$ respectively. Which of the following will be the proper symbol of this species?

Isobaric atoms may contain

The atomic configurations of atoms $A$,$B$,and $C$ are given as: $A = [Z(90) + n(146)]$,$B = [Z(92) + n(146)]$,$C = [Z(90) + n(148)]$. Which of the following statements are incorrect?
$(a) A$ and $C$ are isotones.
$(b) A$ and $C$ are isotopes.
$(c) A$ and $B$ are isobars.
$(d) B$ and $C$ are isobars.
$(e) B$ and $C$ are isotopes.

An atom has a mass number of $25$ and contains $13$ neutrons in its nucleus. What is the charge of its ion if it forms a stable octet?