Energy of 2s orbital in H, Li, Na, K

Question

Arrange in decreasing order, the energy of 2s orbital in following atoms H, Li, Na, K

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Chemistry Ankush 3 months 1 Answer 162 views 0

Answer ( 1 )

  1. More will be the screening effect, less will be the energy of 2s orbital.

    Since number of electrons are highest in K, so screening effect will be more effective in K than Na and similarly the screening effect will be more in Na than Li and more in Li than H. So

    order of energy of 2s orbital in given atoms will be

    E2s(H) > E2s(Li) >E2s(Na) > E2s(K)

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