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PS TNOM Chapter 4

The Periodic Table

TermDefinition
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
Created by: MrGross