Question 31
The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements?

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Solution

They are isobars.
Isobars differ in atomic number (or the number of protons) but have the same mass 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

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