The 2s and 2p energy levels are different. Which of thefollowing is the best explanation for why this is the case?(i) The 2s and 2p energy levels have different energies inthe hydrogen atom, so of course they will have differentenergies in the sodium atom, (ii) The energy of the 2porbital is higher than that of the 2s in all many-electronatoms. (iii) The 2s level in Na has electrons in it, whereasthe 2p does not.

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Chapter1: Chemical Foundations
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The 2s and 2p energy levels are different. Which of the
following is the best explanation for why this is the case?
(i) The 2s and 2p energy levels have different energies in
the hydrogen atom, so of course they will have different
energies in the sodium atom, (ii) The energy of the 2p
orbital is higher than that of the 2s in all many-electron
atoms. (iii) The 2s level in Na has electrons in it, whereas
the 2p does not.

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