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AP chapt. 12 vocabul
chapter 12 vocabulary
Question | Answer |
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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. |