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They are very reactive. They all have one valence electron.the futher down you look in the group, the more reactive is the element that come next. They all tend to form positive ion and when they form ion, the ion are always smaller then the parent atom.
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An element is a pure substance that can contain only one only one kind of atom while a compounds is a pure substances made up of atom of two or more different element join by chemical bonds. Atom and molecule are very similar. They are the smallest unit of a substance that keep all the … Read more