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Ch5 Vocabulary
Chapter 5 vocabulary for 7th Grade Science
Term | Definition |
---|---|
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. |