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actinides, alkali, atom, atomic, atomic number, background, chart, chemical, chemical element, chemistry, color, copper, earth metal, education, element, element symbols, elements, gas, graphic, group, halogen, hydrogen, illustration, information, inorganic, laboratory, lanthanide, malleable, material, mendeleev, metal, metalloid, noble, noble gas, nonmetal, number, oxygen, period, periodic, periodic table, physics, school, science, scientific, substance, symbol, table, technology, transition,