An atom has $26$ electrons and its atomic weight is $56$. The number of neutrons in the nucleus of the atom will be

Which of the following pairs are isoelectronic with one another?

Which from the following statements is $NOT$ true about isotopes?

An isotone of $_{32}Ge^{76}$ is:
$(i) \, _{32}Ge^{77}$
$(ii) \, _{33}As^{77}$
$(iii) \, _{34}Se^{77}$
$(iv) \, _{34}Se^{78}$

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:

Atomic weights of carbon,nitrogen and oxygen are $12, 14$ and $16$ respectively. An atom of atomic weight $14$ and nuclear charge $+6$ is an isotope of