(chatquestion)...Identify d-block element ? 77. (1) [Xe] 4f'4 5d' 6s² (2) [Rn] 5f\4 6d' 7s? (3) [Xe] 4fl4 5d10 6s² (4) [Rn] 6d² 7s?...(What is the trick behind solving these questions? I m not able to identify the blocks.)

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