Pairs of elements with the same number of ele | vedclass

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(D) The electronic configurations of the given elements are:$Eu (63): [Xe] 4f^7 6s^2$$Gd (64): [Xe] 4f^7 5d^1 6s^2$$Dy (66): [Xe] 4f^{10} 6s^2$$Ho (67

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$A$ and $C$ Only

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(D) The electronic configurations of the given elements are:$Eu (63): [Xe] 4f^7 6s^2$$Gd (64): [Xe] 4f^7 5d^1 6s^2$$Dy (66): [Xe] 4f^{10} 6s^2$$Ho (67): [Xe] 4f^{11} 6s^2$$Yb (70): [Xe] 4f^{14} 6s^2$$Lu (71): [Xe] 4f^{14} 5d^1 6s^2$$Tm (69): [Xe] 4f^{13} 6s^2$$Hf (72): [Xe] 4f^{14} 5d^2 6s^2$Comparing the number of electrons in the $4f$ orbital:Pair $A$ ($Eu$ and $Gd$): Both have $7$ electrons in the $4f$ orbital. (Correct)Pair $B$ ($Dy$ and $Ho$): $Dy$ has $10$ and $Ho$ has $11$ electrons. (Incorrect)Pair $C$ ($Yb$ and $Hf$): Both have $14$ electrons in the $4f$ orbital. (Correct)Pair $D$ ($Lu$ and $Tm$): $Lu$ has $14$ and $Tm$ has $13$ electrons. (Incorrect)Therefore, pairs $A$ and $C$ are correct.

Pairs of elements with the same number of electrons in their respective $4f$ orbital are [Atomic number: $Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72$]. Choose the correct answer from the options given below:

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