Noble Gases

Why can helium be placed in group II?

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2010-02-16 10:39:04

The reason it can be placed in group II is because it has 2

electrons in its outside shell (also its only shell) and the groups

represent how many electrons in the elements outside shell, the

reason it is normally placed in group 8 or 0 is because the first

shell has a maximum of 2 electrons and all elements that have a

full outside shell are placed in group 8/0 and can't normally

react.


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