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9Sci CH12
9th Science CH12 Elements and Their Properties
| Term | Definition |
|---|---|
| allotrope | different structural forms of the same element; for example, some carbon molecules form soft graphite, whereas others form hard diamonds |
| diatomic molecule | a molecule composed of two atoms of the same element |
| ductile | ability of metals to be pulled into wires |
| malleable | ability of metals to be hammered or rolled into thin sheets |
| metallic bonding | the type of chemical bond in which positively charged ions are surrounded by freely moving electrons; metallic bonding holds metals together |
| radioactive element | an unstable element whose nucleus breaks down and gives off particles, radiation, and energy |
| semiconductor | an element that conducts electricity under certain conditions |
| sublimation | the process in which a solid changes directly into a vapor without forming a liquid |
| transition element | an element in Groups 3-12 of the periodic table; typically these are metals with one or two electrons in their outer energy level |
| transuranium element | any element having more than 92 protons, the atomic number of uranium |
Created by:
djhockett5
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