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I have found in the textbook that Be has negative electron affinity while Ca has positive why? how can I compare the electron affinity values of these two.?

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  • $\begingroup$ You can compare by comparing electronegativities of each of them. In general electron affinity is directly proportional to electro negativity. $\endgroup$
    – JM97
    Sep 16, 2016 at 15:35
  • $\begingroup$ explain a bit.. $\endgroup$
    – Dawood Ibrar Bilandkhel
    Sep 16, 2016 at 15:49

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