According to modern atomic theory atoms of argon and calcium have same atomic weight, these are known as :

Isobars

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Isotopes

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None of these

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Both a and b

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Solution

The correct option is B Isobars
Atoms having same atomic weights are known as isobars.

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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

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