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why is it 3d(10 elements) in the fourth period and not 4s(2 elements),4d(10 elements),4p(6 elements)? pls explain...why is '3'd coming there??

Asked by Harini A 12th September 2013, 7:36 PM
Answered by Expert
The number of elements we decide by considering the subshells according to aufbau principle and the 4s starts fiiling before 3d ,and 5s starts before 4d, so we donot consider 4d ..and so the fourth period  have 18 elements.
Answered by Expert 12th September 2013, 10:37 PM
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