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chapter 12 vocabulary
Term | Definition |
---|---|
periodic | describing something that occurs or repeats at regular intervals |
periodic law | the law that states that the repeating chemical and physical properties of elements change periodically with the 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, rubiium, cesium, and francium) |
alkaline-earth metals | one of the elements of Group 2 of the periodic table(berylium, magnesium, calcium, strontium, barium, and radium) |
halogen | one of the elements of Group 17 of the periodic table (flourine, 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 |