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PS TNOM Chapter 4
The Periodic Table
Term | Definition |
---|---|
Dmitri Mendeleev | 1834-1907 Developed the first periodic table useful in predicting future elemental discoveries. He placed the elements in order of increasing mass |
Henry Moseley | 1887-1915 Developed the first periodic table based in increasing atomic number |
Period | A row on the periodic table |
Group | A column on the periodic table |
Representative Elements | Those elements constituting groups 1A-8A of the periodic table |
Transition Metals | Those elements constituting groups 13-18 of the periodic table |
Metal | An element with luster and is generally a good conductor of heat and/or electricity |
Metaloid | An element that shares some properties with metals and some with non-metals |
Semiconductor | Does not conduct electricity as well as a metal, but does conduct better than a non-metal |
Catalyst | A material that can increase the rate of a chemical reaction, but is not used up in the process |
Synthetic Elements | Elements greater than number 92 on the periodic table. These are man-made |