Which series of elements are radioactive?

  • A
    Lanthanoids
  • B
    Actinoids
  • C
    Transition metals
  • D
    Alkali metals

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Lanthanide contraction occurs because

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Which statement is incorrect for the electronic configuration $[Xe]\, 4f^{7}\, 5d^{1}\, 6s^{2}$?

Which of the following properties decreases on moving from $Ce$ to $Lu$?

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