The triad of nuclei, which is isotone, is

Consider the following statements $(\mathrm{X}$ and $\mathrm{Y}$ stand for two different elements$)$

$\mathrm{I}.$ $32{\mathrm{X}}^{65}$ and ${}_{33}\mathrm{Y}^{65}$ are isotopes.

$\mathrm{II}.$ $42X^{86}$ and $42Y^{85}$ are isotopes.

$\mathrm{III}.$ $85{\mathrm{X}}^{174}$ and $88{\mathrm{Y}}^{177}$ have the same number of neutrons.

$\mathrm{IV}.$ $92X^{235}$ and ${}_{94}\mathrm{Y}^{235}$ are isobars.

The correct statements are:

Atoms which have different atomic numbers, different mass numbers but the same number of neutrons are called

An isotone of ${}_6^{14}C$ is

The reaction rates of the individual isotopes are

Which of the following pairs represents isobars?

The atoms which have the same mass number but different atomic numbers are called

The nuclei ${}_{52}T{e}^{130}, {}_{54}X{e}^{130}$ and ${}_{56}B{a}^{130}$ are isobars as they have

The nuclei, which are not identical but have the same number of nucleons, are called

Calcium atom and $C{a}^{2+}$ ions have

is isoelectronic with

Which of the following are isotopes?