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AP chapt. 12 vocabul

chapter 12 vocabulary

QuestionAnswer
periodic describes something that occurs or repeats at a regular interval.
periodic law the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
period in chemistry, a horizontal row of elements in the periodic table.
group a vertical column of elements in the periodic table; elements in a group share chemical properties.
alkali metal one of the elements in group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium)
alkaline-earth metal one of the elements of group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium)
halogen one of the elements of group 17 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 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon); noble gases are unreactive.
Created by: arperry
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