out of first 100 elements, no. of elements having electrons in 3d orbital ( in their complete electronic configuration) are?

tell me the reason

Anirudh
10 Jun
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  Rajeshwari
- 09 Jun
The answer is 80. The 1st 20 elements till Ca does not have 3d orbital filled. Ca valence electrons enter 4s orbital . Filling of the 3d orbital begins after 4s orbital .So the Sc is the first element to have electrons in 3d. After that all elements till 100 has electrons in 3d orbital. so from 21 to 100 all have 3d electrons.
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  Mrthika
- 06 Jun
10 elements
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