| A | B |
|---|
| solids | most metals are ___________ at room temperature |
| graphite | an allotrope of carbon that is soft |
| diamond | allotrope of carbon that is hard and used in jewelry |
| allotropes | different forms of the same element that have different properties |
| halogen | salt former |
| metalloids | substances that conduct electric current only under certain conditions are usually___________- |
| Hydrogen | is grouped with alkali metals because it has only one electron in the outer level |
| transition elements | found in Groups 3-12 |
| metallic bonds | elements in which the outer electrons are NOT held tightly together often form |
| mercury | the only metal that is liquid at room temperature |
| alkaline earth metals | Group of elements that have 2 electrons in outer energy level |
| mercury, zinc and cadmium | transition elements of Group 12 |
| helium | the only noble gas with less than 8 electrons in outer level |
| ductile | metals that can be formed into wire |
| Group 1 elements | H,Li,Na,K,Rb,Cs,Fr |
| malleable | can be hammered into shapes |
| noble gases | do not form compounds because they are stable |
| physical properties of metals | shiny, malleable, ductile, hard, solid, conductors |
| Three | atomic number of an element with three protons |
| coin metals | Cu, Ag, Au are unreactive and found in nature |
