which element is leas reactive ?
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Elements in group 17 include fluorine and chlorine. Group 1 of the periodic table includes hydrogen and the alkali metals. Because they have just one valence electron, group 1 elements are very reactive.
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Answer Expert Verified. Helium is the least reactive element in the reactive series. Helium is a noble gas. It's chemical symbol is He and it's atomic number is 2.
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