Answer:

Isotope → Isotopes are atoms with the same number of protons, but differ in numbers of neutrons. Isotopes are different forms of a single element.

• Example - Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons.

The atoms that have same number of nucleons. Isobars of different chemical elements have different atomic number but have the same mass number.

Example of isobar is given as

40 Ca 20and 40 K

Both have same mass number but different atomic number, so these are isobars of each other.

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Answer:

1. Atoms of the same element may have different atomic mass. (discovery of isotopes 17Cl35, 17Cl37.

2. Atoms of different elements may have same atomic masses(discovery of isobars 18Ar40, 20Ar40.

Explanation:

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