why the elemnt of groups 1 and 7 are mostly used in form of compounds ?

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please can someone help me with this question ?

Posted Sun 21st October, 2012 @ 13:57 by AsadRahim

2 Answers

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im just guessing here but is it because they are highly reactive?

Answered Wed 24th October, 2012 @ 17:35 by M
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It's because the elements in group 1 of the periodic table have 1 valence electron (1 electron in their outer shell) and elements in group 7 need just 1 more electron until they have a completely filled outer shell, because they have 7 electrons in their outer shell. So a group 1 element can form an ionic bond with a group 7 element, by the simple transfer of 1 electron from the group 1 element to the group 7 element. This forms an ionic compound. 

They can easily bond when both are present.

Answered Sun 28th October, 2012 @ 17:56 by Former Member