Name: Angela T.
Why is the electron affinity of the 2a family members
such as Be are so highly endothermic or positive?
Electron affinity is a measure of the attraction an element has for an
Those elements that have a high attraction for electrons, to form a closed
shell in the case of the halides have a more negative (i.e. exothermic)
energy. They "want" to attract an electron. Metals on the other hand,
especially those in group I and II have very little propensity to gain an
electron and form an anion. To the contrary they readily LOSE electrons to
Hence, their endothermic electron affinity.
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Update: June 2012