The atomic number of calcium and argon are $20$ and $18$ respectively, but the mass number of both these elements is $40$ . Such pair is called:

Isotopes

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Isomers

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Isobars

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Isotones

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Solution

The correct option is C Isobars
They both constitute a pair of isobars. Isobars are the atoms having the same mass number but a different atomic number.

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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

An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

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