The electronic configuration of a dipositive ion $M^{2+}$ is $2, 8, 14$ and its atomic mass is $56$. The number of neutrons in the nucleus would be :

What are the similarities and differences between $Mg$ and $Mg^{2+}$?

The difference between $_{17}Cl^{35}$ and $_{17}Cl^{37}$ is in the:

Which one of the following is not an iso-electronic pair?

To determine the masses of the isotopes of an element,which of the following techniques is useful?

Write the complete symbol for the atom with the given atomic number $(Z)$ and atomic mass $(A)$:
$(i)$ $\quad Z=17, A=35$
$(ii)$ $\quad Z=92, A=233$
$(iii)$ $\quad Z=4, A=9$