element, an atom with a certain number of protons, periods, the horizontal rows, groups, the vertical columns, atomic number=, number of protons, number of protons=, number of electrons, atomic mass - atomic number=, number of neutrons, group 1, alkali metals, group 7, halogens, group 8, noble gasses, metals, most of the left side of the periodic table (except hydrogen), non-metals, a small amount of elements on the right side of the periodic table, properties, atoms in the same group share the same

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