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?
NEET Foundation 2022.
Biology Foundation for Class 10.
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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
and is 
are isobars