MCQ
Set of orbital filled just after the filling of electron in atom $z = 56$ is
  • A
    $\boxed{6p}\,\,\boxed{7s}\,\,\boxed{5f}$
  • B
    $\boxed{5d}\,\,\boxed{6p}\,\,\boxed{7s}$
  • C
    $\boxed{6s}\,\,\boxed{4f}\,\,\boxed{5d}$
  • $\boxed{4f}\,\,\boxed{5d}\,\,\boxed{6p}$

Answer

Correct option: D.
$\boxed{4f}\,\,\boxed{5d}\,\,\boxed{6p}$
d
$_{56}Ba = \left[ {xe} \right]\,6{s^2} \to \,\boxed{4f}\, \to \boxed{5d}\, \to \boxed{6p}\, \to \boxed{7s}.....$

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