Argon has atomic number of 18 and mass number of 40 calcium has atomic 20 and mass number 40 calcium and argon are examples of ------

Answer:

Atoms of different elements with different atomic numbers and the same mass number are known as isobars.

Isobars are defined as the atoms that have the same number of nucleons.
Isobars of different chemical elements have different atomic number but have the same mass number.
The pair has the same atomic mass which is 40 and different atomic number 20 and 18 respectively.

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