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In what directions (on the periodic table) does atomic size increase?

As you go down in a group, size increases, and as you go LEFT size increases. Size decreases as one goes right within a period.

http://www.sparknotes.com/chemistry/fundamentals/atomicstructure/section3.rhtml

Thanks! That helps alot!

What is more electronegative: oxygen or arsenic?

oxygen is about 3.5; As is about 2.

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