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What group is Hydrogen in since it isn't in group 1?
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It is in group one, because it has 1 electron in its outer shell. Groups basically determine how many electrons are on an elements outer shell. E.g. Calcium is in group 2, meaning it has 2 electrons in its outer shell.
Well, the reason why it's in group one is because it has one electron in it's 1s orbital, that's technically it's outermost shell.
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