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d and f BLOCK ELEMENTS
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What is the ground state electronic configuration of Lanthanum (La, Z=57)?
A. [Xe] 4f¹ 6s²
B. [Xe] 5d¹ 6s²
C. [Xe] 4f¹ 5d¹ 6s¹
D. [Xe] 4f⁰ 6s²
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