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PHS 110 Lesson 12 Periodic Table
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| A | B |
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| Group | Vertical column of elements |
| Period | Horizontal row of elements |
| Group 1 elements | Alkali metals |
| Group 2 elements | Akaline-earth metals |
| Group 17 elements | Halogens |
| Group 18 elements | Noble gases |
| Metaloids or semiconductors | Ge, Sb, As, for example |
| Transition metals | Mn, Fe, Cu, for example |
| Radioactive elements | elements with atomic number > 82 |
| Anion | Negative ion |
| Ion | Charged particle |
| Cation | Positive ion |
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