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The increase in the atomic radii of the third (5d) series of transition elements is very small, which may be accounted for the filling of ' $\mathrm{X}$ ' orbitals before ' $\mathrm{Y}$ ' orbitals. $\mathrm{X}$ and $\mathrm{Y}$ are
$\mathbf{X} \quad \mathbf{Y}$
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$\mathbf{X} \quad \mathbf{Y}$
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Verified Answer
The correct answer is:
4f 5d
According to Aufbau rule, lower energy orbitals filled first as compare to higher energy orbitals. Hence, $4 \mathrm{f}$ orbital filled first than $5 \mathrm{~d}$ orbital.
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