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  • 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?

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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Answer:

Elements with the same mass number (A) but different atomic numbers (Z) are called isobars. Calcium and Argon are isobars. Hence _{20}^{40}\textrm{Ca} and is _{18}^{40}\textrm{Ar} are isobars

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