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Hydrogen is the lightest element in the periodic table. Hydrogen is a nonmetal gas and part of Group 1 because it very?
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Hydrogen is the lightest element in the periodic table. Hydrogen is a nonmetal gas and part of Group 1 because it very?

User Dima Grossman
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Hydrogen is in group 1 because it is very reactive and has one valence electron.
User Strawtarget
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