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 '16 at 15:35
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$\begingroup$ explain a bit.. $\endgroup$ – Dawood Ibrar Bilandkhel Sep 16 '16 at 15:49
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