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Gas-phase atoms of which element has an occupied 5 $d$ . Orbital in their ground state?

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$Ag (Z = 47)$

$Eu (Z = 63)$

$Ir (Z = 77)$

$Ba (Z = 56)$

answer is D.

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Detailed Solution

Gas-phase atoms of which element has an occupied 5 $d$ . Orbital in their ground state is $Ir (Z = 77)$ .

The ground state configuration of electron for gaseous neutral iridium is [Xe]. $4 f^{14} . 5 d^{7} .$

From the ground state electron configuration, it is observed that iridium occupies the d orbital in their ground state.

Hence, iridium has an occupied 5d orbital in their ground state.

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