Observe the following f-block elements: Eu (Z | vedclass

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(A) The electronic configurations are: $Eu (Z=63): [Xe] 4f^7 6s^2$ (Half-filled $f$-orbital) $Pu (Z=94): [Rn] 5f^6 7s^2$ $Cf (Z=98): [Rn] 5f^{10} 7s^2

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$3$

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(A) The electronic configurations are: $Eu (Z=63): [Xe] 4f^7 6s^2$ (Half-filled $f$-orbital) $Pu (Z=94): [Rn] 5f^6 7s^2$ $Cf (Z=98): [Rn] 5f^{10} 7s^2$ $Sm (Z=62): [Xe] 4f^6 6s^2$ $Gd (Z=64): [Xe] 4f^7 5d^1 6s^2$ (Half-filled $f$-orbital) $Cm (Z=96): [Rn] 5f^7 6d^1 7s^2$ (Half-filled $f$-orbital) The elements with half-filled $f$-orbitals are $Eu, Gd,$ and $Cm$. Total count = $3$.

Observe the following $f$-block elements: $Eu (Z=63)$; $Pu (Z=94)$; $Cf (Z=98)$; $Sm (Z=62)$; $Gd (Z=64)$; $Cm (Z=96)$. How many of the above have half-filled $f$-orbitals in their ground state?

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