Which of the following does not contain a number of neutrons equal to that of $_{18}^{40}Ar$?

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.

Two atoms have the same atomic mass but different atomic numbers. Such atoms are called as:

The atomic number of an element represents:

What is the atomic number of carbon? Give the symbols of its isotopes.

The charge of an electron is $-1.6 \times 10^{-19} \ C$. The value of the net charge on a $Li^{+}$ ion will be: