Question

1 Which of the following pairs is/are correctly matched?
Isotopes: Atoms with same atomic number but different atomic mass
Isobars: Atoms with same number of neutrons but different atomic number
Isotones: Atoms with same mass number but different atomic number

Answer 1

Isotopes : Atoms with same atomic number but different atomic mass (mass numbers)

Answer 2

Answer :

Isotopes : Atoms with same atomic number but different atomic mass

Isobars : Atoms with same mass number but different atomic number

Isotones : Atoms with same number of neutrons but different atomic number

Explanation :

Isotopes : It is defined as the atoms having the same atomic number but differ in the atomic mass.

For example : Hydrogen $(^1_1H)$, deuterium $(^2_1H)$ and tritium $(^3_1H)$ are the isotopes of hydrogen.

Isobars : It is defined as the atoms having the same mass number but differ in the atomic number.

For example : Nitrogen $(^{14}_7N)$ and carbon $(^{14}_6C)$ are the isobars.

Isotones : It is defined as the atoms having the same number of neutrons but differ in the atomic number.

For example : Nitrogen $(^{15}_7N)$ and carbon $(^{14}_6C)$ are the isotones.