Q.

Electronic configuration of Tungsten (At no=74)

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a

[Xe]4f14  5d4  6s2

b

[Xe]4f14  5d5  6s1

c

[Xe]4f14  5d6  6s0

d

[Xe]4f14  5d5  6s0

answer is A.

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Detailed Solution

electron can transfer between 5d and 4fbut cannot between 6s and 5d
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