PerTabDefs - Some Definitions Related to the Periodic Table...

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Some Definitions Related to the Periodic Table group - a column in the periodic table, listing elements that tend to show similar chemical behavior. In North America, groups are numbered 1 through 8 (or 0) with appended letter designations A or B (e.g., 1A, 3B). The newer I.U.P.A.C. system uses numbers 1 through 18. period - a row in the periodic table. Periods are numbered 1 through 7. main group elements (or representative elements ) - members of the A group elements (North American system); i.e., groups 1A and 2A, and 3A (13) through 8A (18) (newer I.U.P.A.C. system designations in parentheses). transition elements - members of the B group elements (North American system), corresponding to the groups 3 through 12 in the I.U.P.A.C. system. The first, second, and third transition series span these groups in periods 4, 5, and 6, respectively. [Element number 89 (actinium, Ac) in period 7 begins a fourth transition series that would be continued with elements 104 through 112, but these are all unstable, synthetic
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PerTabDefs - Some Definitions Related to the Periodic Table...

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