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d and f BLOCK ELEMENTS
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What is the electronic configuration of the ground state of Iridium (Ir, Z=77)?
A. [Xe] 4f¹⁴ 5d⁶ 6s³
B. [Xe] 4f¹⁴ 5d⁸ 6s¹
C. [Xe] 4f¹⁴ 5d⁵ 6s⁴
D. [Xe] 4f¹⁴ 5d⁷ 6s²
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