What are the observed periodic trends in electron affinity?

JuanJong

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A. for main-group elements, electron affinity generally becomes more negative as you move to the right across a row

B. for main-group elements, electron affinity generally becomes more positive as you move to the right across a row

C. there is not a corresponding trend in electron affinity going right across a row

D. for main-group elements, electron affinity generally becomes more negative as you move down a column

E. for main-group elements, electron affinity generally becomes more positive as you move down a column

F. there is not a corresponding trend in electron affinity going down a column
 
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