The correct sequence in which the subshells in sixth period of long form of periodic table are filled is

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4f,5d,6s,6p

5d,4f,6s,6p

6s,4f,5d,6p

6s,6p,4f,5d

answer is C.

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Detailed Solution

Modern periodic table is a graphical representation of Aufbau's principle;Applying (n+l) rule,6s(6+0)<4f(4+3)<5d(5+2)<6p(6+1)….increasing order of energy

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