The correct order of filling up of subshells in seventh period is (A) \( 5 \mathrm{f}, 4 \mathrm...
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0The correct order of filling up of subshells in seventh period is
(A) \( 5 \mathrm{f}, 4 \mathrm{~d}, 6 \mathrm{~s}, 7 \mathrm{~s} \)
(B) \( 7 \mathrm{~s}, 5 \mathrm{f}, 6 \mathrm{~d}, 7 \mathrm{p} \)
(C) \( 5 \mathrm{f}, 6 \mathrm{~d}, 7 \mathrm{~s}, 9 \mathrm{p} \)
(D) \( 7 \mathrm{~s}, 7 \mathrm{p}, 5 \mathrm{~d}, 6 \mathrm{~d} \)
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