Which of the following elements have half-fil | vedclass

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(A) The electronic configurations of the given lanthanoids in their ground state are as follows:$1.$ ${}_{62}Sm: [Xe] 4f^6 6s^2$$2.$ ${}_{63}Eu: [Xe]

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$B$ and $D$ only

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(A) The electronic configurations of the given lanthanoids in their ground state are as follows:$1.$ ${}_{62}Sm: [Xe] 4f^6 6s^2$$2.$ ${}_{63}Eu: [Xe] 4f^7 6s^2$$3.$ ${}_{64}Gd: [Xe] 4f^7 5d^1 6s^2$$4.$ ${}_{65}Tb: [Xe] 4f^9 6s^2$$5.$ ${}_{61}Pm: [Xe] 4f^5 6s^2$$A$ half-filled $f$-orbital contains $7$ electrons $(f^7)$.From the configurations above,$Eu$ $(4f^7 6s^2)$ and $Gd$ $(4f^7 5d^1 6s^2)$ both possess a half-filled $4f$ subshell.Therefore,the correct elements are $B$ $(Eu)$ and $D$ $(Gd)$.

Which of the following elements have half-filled $f$-orbitals in their ground state?
(Given: atomic number $Sm = 62$; $Eu = 63$; $Tb = 65$; $Gd = 64$; $Pm = 61$)
$A.$ $Sm$ $B.$ $Eu$ $C.$ $Tb$ $D.$ $Gd$ $E.$ $Pm$
Choose the correct answer from the options given below:

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Which of the following elements have half-filled $f$-orbitals in their ground state?(Given: atomic number $Sm = 62$; $Eu = 63$; $Tb = 65$; $Gd = 64$; $Pm = 61$)$A.$ $Sm$ $B.$ $Eu$ $C.$ $Tb$ $D.$ $Gd$ $E.$ $Pm$Choose the correct answer from the options given below: