An atom with atomic number $21$ belongs to the category of

  • A
    $s$-block elements
  • B
    $p$-block elements
  • C
    $d$-block elements
  • D
    $f$-block elements

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Transition elements exhibit variable oxidation states because they lose electrons from which of the following orbitals?

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Transition elements form complex compounds primarily due to:

Among the following series of transition metal ions,the one where all metal ions have $3d^2$ electronic configuration is

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