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The electronic configurations of bivalent europium and trivalent cerium are

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The electronic configurations of bivalent europium and trivalent cerium are 

(atomic number : Xe = 54, Ce = 58, Eu = 63)

(1) [Xe] 4f4 and [Xe] 4f9 

(2) [Xe] 4f7 and [Xe] 4f1 

(3) [Xe] 4f7 6s2 and [Xe] 4f2 6s2 

(4) [Xe] 4f2 and [Xe] 4f7

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