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Unformatted text preview: an arrangement of elements in order of increasing atomic number placing those with similar chemical and physical properties in columns. Features of the Periodic Table Groups Vertical columns are called groups. Elements within a group have similar chemical and physical properties. Groups are designated at the top by the numbers 1-8 and by the letters A and B. (Note: group labeling is somewhat arbitrary, so watch out for other designations, particularly with A and B.) A group elements- Representative or main group elements B group elements- Transition elements In addition to the number-letter designation, some groups have their own name. 1A → alkali metals 2A → alkaline earths 7A → halogens 8A → noble gases or rare gases...
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