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d and f BLOCK ELEMENTS
Question #40158
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What is the electronic configuration of Actinium (Ac)?
A. [Rn] 5f1 7s2
B. [Rn] 5f1 6d1 7s2
C. [Rn] 6d1 7s2
D. [Rn] 5f0 6d0 7s2
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