How is the table organized? The Periodic Table, first compiled by Russian chemist Dmitri Mendeleyev, is organized by the number of protons in the nucleus of each element's atom, known as the ...
The periodic table The periodic table is a chart of all ... all react vigorously with water to produce an alkaline solution. Group 7 halogens The Group 7 elements are also known as the halogens.
The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.
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