The nitride ion in lithium nitride is composed of:

The atomic number of an element represents

The electronic configuration of a divalent metal ion $M^{2+}$ is $2, 8, 14$ and its atomic mass is $58 \, a.m.u.$ What is the number of neutrons in its nucleus?

Identify the isoelectronic pair from the following.

Regarding the two isotopes $_{13}Al^{27}$ and $_{14}Si^{27}$,which of the following statements is correct?

The number of electrons in $Cl^{-}$ ion is