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Chapter twelve vocab
science vocabulary Chap. 12
Vocabulary | Definition |
---|---|
Periodic | Describes something that occurs or repeats at regular intervals. |
Periodic law | the law that states that the repeatingchemical and physical propertiesof 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 metals | one of the elements of Group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium) |
alkaline-earth metal | one of the elements of Groups 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 |