$({}_{32}Ge^{76}, {}_{34}Se^{76})$ and $({}_{14}Si^{30}, {}_{16}S^{32})$ are examples of

If the electronic configuration of a metal ion $M^{2+}$ is $2, 8, 14$ and its atomic mass is $56 \, a.m.u.$,then the number of neutrons in its nucleus is .....

Calculate the number of protons,neutrons and electrons respectively in ${}^{14}_{7}N^{3-}$.

Which property of an element is always a whole number?

Which of the following species are isoelectronic species? $(i)$ $O^{2-}$,$(ii)$ $F^{-}$,$(iii)$ $Na^{+}$,$(iv)$ $Mg^{2+}$

Which one of the following sets of ions represents a collection of isoelectronic species? (Given: Atomic Number: $F: 9, Cl: 17, Na: 11, Mg: 12, Al: 13, K: 19, Ca: 20, Sc: 21$)