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Q.

Electronic configuration of Tungsten (At no=74)

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a

$[X e] 4 f^{14} 5 d^{4} 6 s^{2}$

b

$[X e] 4 f^{14} 5 d^{5} 6 s^{1}$

c

$[X e] 4 f^{14} 5 d^{6} 6 s^{0}$

d

$[X e] 4 f^{14} 5 d^{5} 6 s^{0}$

answer is A.

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Detailed Solution

electron can transfer between 5d and 4f

but cannot between 6s and 5d

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