| A | B |
|---|
| families | vertical rows on the periodic table |
| periods | horizontal rows on the periodc table |
| periodic law | law that states that the physical and chemical properties of the elements are periodic functions of their atomic numbers |
| groups | also known as families |
| metal | element that is a good conductor of heat and electricity, is shiny, has a high melting point, is ductile and malleable, and tends to lose electrons. |
| luster | shininess |
| ductile | able to be drawn into thin wire |
| malleable | able to be hammered out into a thin sheet |
| corrosion | gradual wearing away of a metal due to a chemical reaction in which the metal element is changed into a metallic compound. |
| nonmetal | element that is a poor conductor of heat and electricity, has a dull surface, low melting point, is brittle, breaks easily, and tends to gain electrons. |
| metalloid | element that has properties of both metals and nonmetals. |
| alkali metal | member of element family 1 that has 1 valence electron. |
| alkaline earth metal | member of element family 2 that has 2 valence electrons. |
| transition metal | element that has properties similar to other transition metals and to other metals but whose properties do not fit with those of another family. |
| halogen family | family 17 of the periodic table; elements have atoms that contain 7 valence electrons. |
| noble gas | member of family 18 of the periodic table; elements have atoms that have 8 valence electrons. |
| rare-earth elements | elements found in the lanthanoid & actinoid series |
| lanthanoid series | soft, malleable metals with high luster & conductivity- 1st row of rare-earth elements |
| actinoid series | radioactive elements- 2nd row of rare-earth series |
