Periodic table

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A simple periodic table, showing elements color-coded by type.

In chemistry, periodic table (TR:122) (LH:31) (TL:153) grouping of the 118+ elements, 92 of which naturally occur, 26 of which comprise humans, in into a table ordered by rows, where each row has a distinct valence shell size, and columns, each column ordered by increasing electron count in the valence shell.


The following are related quotes:

“I saw in a dream a table where all the elements fell into place as required.”
Dmitri Mendeleyev (1869), Publication (pg. #) [1]

End matter

See also


  1. Strathern, Paul. (2000). Mendeleyev’s Dream: the Quest for the Elements (pgs. 286-87). Berkeley Books.

External links

Theta Delta ics T2.jpg