Question

Atoms with same atomic number and different mass numbers are called

• A. isobars
• B. isomers
• C. isotones
• D. isotopes

Answer 1

Answer: (D)

Isotopes have the same atomic number but different mass numbers eg, ${}_1{H}^1,{}_1{H}^2,{}_1{H}^3$ are the isotopes of hydrogen.