The electronic configurations of bivalent europium and trivalent cerium are (atomic number : Xe = 54, Ce = 58, Eu = 63)

Question

The electronic configurations of bivalent europium and trivalent cerium are
(atomic number : Xe = 54, Ce = 58, Eu = 63)

[Xe] 4f⁷ 6s² and [Xe] 4f² 6s²

[Xe] 4f² and [Xe] 4f⁷

[Xe] 4f⁴ and [Xe] 4f⁹

[Xe] 4f⁷ and [Xe] 4f¹

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