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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1300 Period Tables in the database: 

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Year:  2005 PT id = 157

Student's Periodic Table

Students are expected to know that in all equations hydrogen is molecular should [nearly always] be written as H2. Likewise, nitrogen is N2, oxygen O2, fluorine F2, chlorine Cl2, bromine Br2 and iodine I2. But somehow students are expected to know that molecular sulfur, S8, should be written as S and molecular phosphorus, P4, should be written as P.

By Mark Leach

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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