What are the observed periodic trends in electron affinity?

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What are the observed periodic trends in electron affinity?

Check all that apply.

1.) for main-group elements, electron affinity generally becomes more negative as you move to the right across a row
2.) for main-group elements, electron affinity generally becomes more positive as you move to the right across a row
3.) there is not a corresponding trend in electron affinity going right across a row
4.) for main-group elements, electron affinity generally becomes more negative as you move down a column
5.) for main-group elements, electron affinity generally becomes more positive as you move down a column
6.) there is not a corresponding trend in electron affinity going down a column
 
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