| A | B |
|---|
| elements that are gases or brittle solids and poor conductors of heat and electricity | nonmetals |
| basis for arranging elements in modern periodic table | atomic number |
| able to be hammered into thin sheets | malleable |
| series of radioactive elements | actinides |
| a row of elements in the periodic table whose properties change gradually and predictability | period |
| elements that show moderate electrical conductivity | semiconductors |
| silvery solids found in Group 1 | alkali metals |
| elements that show properties of both metals and nonmetals | metalloids |
| elements in Groups 3 through 12 of the periodic table | transition elements |
| only nonmetal in Group 1 | hydrogen |
| most chemically inactive group of elements | noble gases |
| another name for Group 2 elements | alkaline earth metals |
| group of elements that form salts | halogens |
| most elements fall into this classification | metals |
| series of elements that are sometimes called the rare earths | lanthanides |
