ALKALI METALS, group one, lithium (3Li), one valence electron, form positive ions, react vigorously with water, sodium (11Na), potassium (19K), lose one electron in chemical reactions, HALOGENS, group seven, chlorine (17Cl), seven valence electrons, form negative ions, react with hydrogen and sodium, fluorine (9F), bromine (35Br), iodine (53I), can gain one electron into the outer shell, NOBLE GASES, group zero, helium (2He), 2 or 8 valence electrons, neon (10Ne), argon (18Ar), krypton (36K), almost completely unreactive, it takes a lot of energy to add or remove electrons from these atoms
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GROUPS (SIMPLE)
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