Composition of the nuclei of two atomic species A and B is given as under :
A
B
Protons :
18
20
Neutrons :
22
20
Give the mass numbers of A and B. What is the relation between the two species and which element or elements they represent ?
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Solution
Mass number is the sum of the number of neutrons and the number of protons. So, mass number of A and B is 40. As the mass number of A and B is same, the two are isobars.
Therefore, A represents Argon while B represents Calcium.