Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus.

Adding an electron to phosphorus releases more energy than adding one to sodium. Using the convention in the question, their electron affinities are about −72 kJ/mol for phosphorus and −53 kJ/mol for sodium, so phosphorus’s value is more negative. The correct choice is “Phosphorus’ electron affinity value is more negative than the electron affinity value of sodium.”

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