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Why is it easier to remove an electron from potassium than sodium?

Why is it easier to remove an electron from potassium than sodium?
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Why is it easier to remove an electron from potassium than sodium?

User Richard Critten
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The outer electron in Potassium is in the 4s orbital, which is further away from the nucleus than the 3s orbital of the Sodium. ... This means that less energy is needed to remove the outermost electron and therefore the ionisation energy is lower.
User Scott Byers
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