Question

Isotopes have the same ______________ but different ___________.

• A. atomic number
• B. mass numbers

Answer 1

Isotopes- Elements that have the same atomic number but different mass numbers are called isotopes.

Example - There are three Isotopes of hydrogen named protium, deuterium, tritium and represented as -

${}_1{}^1\mathrm{H},{}_1{}^2\mathrm{H},{}_1{}^3\mathrm{H}$

Therefore Isotopes have the same atomic number but different mass numbers.