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Which of the following statements about uranium (Z = 92, $[Rn] 5 f^{3} 6 d^{1} 7 s^{2}$ ) are correct?

AThe ground state of the uranium atom has three $5 f$ electrons
B $UF X_{6}$ is a volatile compound
CUranium shows only the $+ 3$ oxidation state
DUranium is in the $+ 6$ state in $UO X_{2} X^{2 +}$

Answer: A, B, D

In

UO X_{2} X^{2 +}

:

x + 2 (- 2) = + 2

gives

x = + 6

.

UF X_{6}

is volatile, and the stated configuration has

5 f^{3}

. Uranium shows +3, +4, +5 and +6, so the last statement is wrong.

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