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Which of the following statements regarding subshell filling order for a neutral atom is/are correct?
(P) Electrons are assigned to the 4s subshell before they are assigned to the 3d subshell
(Q) Electrons are assigned to the 4f subshell before they are assigned to the 6s subshell
(R) Electrons are assigned to the 4d subshell before they are assigned to the 5p subshell

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P, Q and R

P and R

P only

Q only

answer is C.

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Detailed Solution

Statements P and R regarding subshell filling order for a neutral atom are correct

(P) Electrons are assigned to the 4s subshell before they are assigned to the 3d subshell

(R) Electrons are assigned to the 4d subshell before they are assigned to the 5p subshell

The lower energy orbitals are first filled with electrons. Electrons occupy the 4s orbital first, followed by the 3d orbital, since the 4s orbital has a lower energy than the 3d orbital.

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