Periods - Periods . theperiodictable. Th

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Periods Horizontal rows are called  periods . Periods are designated by the numbers on the left in  the periodic table. The two long rows placed just below the main body of the table are  the  inner transition elements . Elements 58-71 are the  Lanthanide Series Elements 90-103 are the  Actinide Series The Three Categories of Elements There are three broad categories of elements called 1. Metals 2. Non-metals 3. Metalloids To separate the metals and non-metals we draw a stairstep line to the left of and  below B, Si, As, Te, andAt. This classification or group is useful because certain properties are associated with each 
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Periods - Periods . theperiodictable. Th

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