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| Elements in groups 1-2 & 13-18 called 'Representative Elements'; they represent a wide range of physical & chemical properties |
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| Hydrogen and elements to the right of the 'staircase'; dull, rigid, nonconductive, solids, liquids, and gases |
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| Elements to the left of the 'staircase'; app. 80% of all elements; shiny, flexible, conductive, mostly solids |
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| Columns of elements with similar physical & chemical properties |
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| Rows of elements arranged by increasing atomic number |
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| 'Father of the Periodic Table'; arranged elements by increasing mass & similar properties; correctly predicted properties of unknown elements |
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| Arranged elements by increasing nuclear charge (atomic #) & similar properties; created the modern periodic table |
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| There is a periodic repetition of physical & chemical properties when elements are arranged by increasing atomic # |
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| Elements in Group 1 (except for Hydrogen) |
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| Inner Transition Metals (or 'Rare Earth' Metals) |
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| Elements #57-70 and #89-102 |
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| Elements along the dividing line between metals & nonmetals with properties of both types of elements |
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