Question

Define isotope.

Answer 1

• Isotopes are the atoms of the same element which have the same atomic and different mass numbers.
• They have similar chemical properties(as their number of valence electrons are equal)and different physical properties.
• Isotopes of hydrogen are protium(${}_1{}^1\mathrm{H}$), deuterium(${}_1{}^2\mathrm{H}$), tritium(${}_1{}^3\mathrm{H}$).