The charge of an electron is $-1.6 \times 10^{-19} \ C$. The value of the net charge on a $Li^{+}$ ion will be:

Which of the following species is $NOT$ isoelectronic with neon?

The isobars are atoms with the same number of

The nuclides (a nuclide is the general name for any nuclear species) $_6C^{12}$,$_{26}Fe^{56}$,and $_{92}U^{238}$ have $12$,$56$,and $238$ nucleons respectively in their nuclei. The total number of nucleons in a nucleus is equal to:

Two atoms of elements $X$ and $Y$ are isotones of each other. Their mass numbers are $70$ and $72$ respectively. If the atomic number of $X$ is $34$,then the atomic number of $Y$ is ..........

Give the relation between the following pairs of species:
$(i)$ $_{20}^{40}Ca$ and $_{19}^{40}K$
$(ii)$ $_{17}^{35}Cl$ and $_{17}^{37}Cl$
$(iii)$ $_{18}^{40}Ar$,$_{20}^{40}Ca$ and $_{19}^{40}K$
$(iv)$ $_{38}^{87}Sr$ and $_{38}^{90}Sr$