Which element from the following has a half-filled $4f$ orbital in its observed ground state?

  • A
    $Gd$
  • B
    $Sm$
  • C
    $Nd$
  • D
    $Ho$

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The common oxidation state of $f$-block elements is $+3$. The other stable oxidation states of $^{63}Eu$ and $^{65}Tb$ are respectively:

The correct statement is

Which of the following statements is incorrect?

The electronic configuration for Neodymium is: (Atomic Number for Neodymium $60$)

The atomic number of cerium $(Ce)$ is $58$. The correct electronic configuration of $Ce^{3+}$ ion is

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