Question

What are the atoms of the same element, having the same atomic number but different mass numbers called?

• A. Isotones
• B. Isotopes
• C. Isobars
• D. Isothermal

Answer 1

The correct option is B Isotopes

The atoms of the same element, having the same atomic number but different mass numbers are called Isotopes.
For example, take the case of hydrogen atom, it has three atomic species, namely protium (H-1), deuterium (H- 2 or D) and tritium (H-3 or T). The atomic number of each one is 1, but the mass number is 1, 2 and 3, respectively.