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An element is isobaric with the inert gas atom ₁₈A⁴⁰. The electronic arrangement of the element is 1s² 2s² 2p⁶ 3s² 3p⁶4s².How many neutrons does each atom of the element carry in its nucleus?

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answer is B.

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Detailed Solution

Atomic number of inert gas atom = 20
Atomic mass of inert gas atom = 40 (isobaric to Ar⁴⁰)
.'. Number of neutrons = 40 - 20 = 20

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