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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a
22
b
20
c
18
d
16
answer is B.
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Detailed Solution
Atomic number of inert gas atom = 20Atomic mass of inert gas atom = 40 (isobaric to Ar40).'. Number of neutrons = 40 - 20 = 20