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Chapter 12 Vocabulary

TermDefinition
periodic describes something that occurs or repeats at regular intervals.
periodic law the law that states the repeating chemical and physical properties of elements change periodically with the atomic number of the elements.
period in chemistry, a horizontal row of elements in the periodic table.
group a vertical columm of elements in a periodic table; elements in a group share chemical properties.
alkali metal one of the elements of group one of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium.)
alkaline-earth metal one of the elements of group two of the periodic table (berylium, magnesium, calcuim, strontium, and radium.)
halogen one of the elements from group seven-teen of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); halogens combine with most metals to form salts.
noble gas one of the elements of group eight-teen of the periodic table (helium, neon, argon, krpton, xenon, and radon); noble gases are unreactive.
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