Multiple choice

The atoms of different element which have the same mass number but different atomic number are called

  1. Isotopes

  2. Isobars

  3. Isotones

  4. None of the above

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B Correct answer
Explanation

Isobars are atoms of different elements with the same mass number but different atomic numbers. This means they have the same total number of nucleons (protons + neutrons) but different numbers of protons. For example, 40Ar (Argon, Z=18) and 40Ca (Calcium, Z=20) are isobars. Isotopes have the same atomic number but different mass numbers, while isotones have the same number of neutrons.