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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
Question
Why is 4s-orbital filled before 3d-orbital?
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Answer

4s-orbital has (n + l) = 4 + 0 = 4,
Which is lower than that of 3d, i.e. 3 + 2 = 5.

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