| Question |
Answer |
| alkali metals | Group 1 (IA) elements that each have one valence electron. |
| alkaline-earth metals | Group 2 (IIA) elements that each have two valence electrons. |
| alloys | A homogeneous mixture of metals. |
| ductile | Capable of being drawn into wire. |
| electron configuration | The number and position of electrons in the energy levels of an atom. |
| family | A vertical column on the periodic table; also called a group. |
| group | Another name for a family on the periodic table. |
| halogens | Reactive elements in Group 17 (VIIA) that have seven valence electrons. |
| luster | Capable of reflecting light. |
| malleable | Capable of being hammered or rolled. |
| metals | An element that tends to give up electrons in a chemical reaction. |
| metalloids | A substance that has properties of both metals and nonmetals. |
| noble gases | Stable elements found in Group 18 (VIIIA) that have eight valence electrons. |
| nonmetals | An element that tends to gain electrons in a chemical reaction; poor conductor of heat and electricity. |
| periods | A horizontal row in the periodic table, also called a series. |
| periodic law | The chemical properties of the elements are periodic functions of their atomic numbers. |
| periodic table | A table of the elements arranged by atomic number into vertical columns called families or groups, and horizontal rows called periods. |
| series | Another name for a period in the periodic table. |
| transition elements | Strong metals in Groups 3-12 (IB through VIIIB). |
| transuranium elements | An element with an atomic number higher than that of uranium. |
| valence electrons | The electrons in the outermost energy level of an atom. |
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