Question
Sun February 03, 2013 By:
 

Why can hydrogen be placed both in group1 and group 17?

Expert Reply
Tue February 05, 2013
H has 1 e- in the outer ring like those in column 1, and likes to give it away forming H+, a positive ion.

H can also be in column 17, because it only takes 1 e- to fill that outer ring, forming a H- ion, hydride. Like the res of column 17, it only takes 1 e- to make it stable
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