Question: Explain why it would be incorrect to calculate the experimental ground-state energy of lithium by taking - (E2s + 2E1s), where E2s is the experimental

Explain why it would be incorrect to calculate the experimental ground-state energy of lithium by taking - (E2s + 2E1s), where E2s is the experimental energy needed to remove the 2s electron from lithium and E1s is the experimental energy needed to remove a 1s electron from lithium.

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