Which of the following elements shows the maximum number of different oxidation states in its compounds?

  • A
    $Eu$
  • B
    $La$
  • C
    $Gd$
  • D
    $Am$

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Which is not the correct statement? (At. nos. $Ce = 58, Lu = 71, La = 57, Yb = 70$)

The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium $= 99$)

Which of the following ions is the strongest oxidizing agent? [ Atomic Number of $Ce = 58, Eu = 63, Tb = 65, Lu = 71$ ]

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:

Which of the following hydroxides is the most basic?

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