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Which of the following statements regard...

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

A

i only

B

ii only

C

i and ii

D

i,ii and iii

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