PERIODIC TABLE
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Alkali Metals
Alkaline Earth Metals
Transition Metals
Nonmetals
Metalloids
Halogens
Noble Gases
Ionic Bonding
Halogens
Halogen means "salt forming". All of the Halogens are very reactive because they only need one more valence electron to get 8, and get a full outer shell. Uncombined elements are dangerous to humans.
Halogens