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Q.

Which of the following has magic number of neutrons?

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a

13Al27

b

83Bi209

c

92U238

d

26Fe56

answer is B.

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Detailed Solution

Magic numbers are 2, 8, 20, 28, 50, 82, 126, These number in the case of protons by comparing the number of stable isotopes for different number of proton. For neutrons the magic numbers were found by comparing the number of stable nuclides and the same number of neutrons.
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