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Ch5 Vocabulary

Chapter 5 vocabulary for 7th Grade Science

Periodic (Sec.1) Describes something that occurs or repeats at regular intervals (Repeats Regularly)
Periodic Law (Sec.1) The law that states that the repeating chemical and physical properties of elements change periodically with the atomic number of elements. (The elements properties [physical and chemical] change with the atomic number.)
Period (Sec.1) In chemistry, a horizontal row of elements in the periodic table. (Elements going across)
Group (Sec.1) A vertical column of elements in the periodic table; elements in a group share chemical properties. (Elements going up and down)
Alkali Metal (Sec.2) One of the elements of group 1 of the periodic table. (Lithium, sodium, potassium, rubidium, cesium, and francium)
Alkali-earth metal (Sec.2) One of the elements of group 2 of the periodic table. (Beryllium, magnesium, calcium, strontium, barium, and radium.)
Halogen (Sec.2) 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.
Nobel Gas (Sec.2) One of the elements of group 18 of the periodic table. (helium, neon, argon, krypton, xenon, and radon); noble gases are nonreactive.
Created by: fordm.21