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

Identify the isoelectronic species from the following groups.

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.

Assertion : The sum of protons and neutrons is always different in isobars.
Reason : Isobars are atoms of different elements having same mass number but different atomic number.

Which of the following pairs is an example of isoelectronic species?

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