The number of unpaired electrons in the uranium $(_{92} U)$ atom is:

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Solution

The correct option is A 4
The electronic configuration of uranium atom is,
$_{92} U \to [_{86} R n] 5 f^{3} 6 d^{1} 7 s^{2}$
$∴$ No. of unpaired electrons is $3 + 1 = 4$

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