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d and f BLOCK ELEMENTS
Question #39767
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Question
What is the ground state electronic configuration of Erbium (Er, Z=68)?
A. [Xe] 4f¹¹ 6s²
B. [Xe] 4f¹² 6s²
C. [Xe] 4f¹³ 6s²
D. [Xe] 4f¹² 5d¹ 6s¹
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