4 rows...of 18 each............................starting at row 4.....symtery.......4 - 7.........rows, 4 - 7.........like the prime number.....47.............and what the 1st 10 digits of e add up to ..........72 elements........4 - 7.................................4.5 of a difference between e to the 1.......truncated at its 1st 2 numbers....like the critical line at 1/2......and 7.2.......e squared...using 2.7......as e............

Periodic table

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This article is about the table used in chemistry and physics. For other uses, see Periodic table (disambiguation).

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Periodic table
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The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends. Generally, within one row (period) the elements are metals to the left, and non-metals to the right, with the elements having similar chemical behaviours placed in the same column. Table rows are commonly called periods and columns are called groups. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.