ICSE Class 6 Answered

Hi Chitransh,

Atoms of the same element differing in the number of neutrons in their nuclei are known as isotopes. Thus, isotopes of an element have the same atomic number but different atomic mass numbers.
Isotopes are identified by their mass numbers.
For example, the isotopes of carbon are referred to as carbon-12, carbon-13 and carbon-14.
Isotopes of an element have similar chemical properties but different physical properties.

The atoms of different elements having different atomic numbers but the same mass number are known as isobars.Thus, isotopes of an element have the same atomic mass but different atomic number.

Since Isobars differ in the number of electrons, they have different chemical properties and physical properties.

Examples of Isobars