Which of the following are pairs of isotopes?

State whether the following statements are true or false:
$(i)$ Isobars have different atomic numbers.
$(ii)$ $_{14}^{30}\text{Si}$,$_{16}^{32}\text{S}$ are isotones.
$(iii)$ Niels Bohr was the first to suggest that the atom is spherical.
$(iv)$ Rutherford's model is accepted as the nuclear model of the atom.

$Na^{+}$ ion is isoelectronic with

What are atomic number,nucleons,and mass number? Give the relation between them.

Six protons are found in the nucleus of

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