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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Composition of the Nuclei of Two Atomic Species a and B is Given as Under : A B Protons : 18 20 Neutrons : 22 20 - Science

Question

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 ?

Short/Brief Note

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 (`""_18^40"Ar"`) Argon while B represents (`""_20^40"Ca"`) Calcium.

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Chapter 4: Structure of the Atom - Very Short Answer Type Questions [Page 213]