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Q.

Electronic configuration of the element with atomic number 56 and mass number 138 is

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a

[Xe]6s2

b

[Kr]5s2

c

[Xe]6s2 6p2

d

[Xe]3d2 5d2

answer is A.

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Detailed Solution

Electronic configuration of the element with atomic number 56 and mass number 138 is: 1s22s22p63s23p64s23d104p65s24d105p66s2

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