The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate recurrence of their properties is evident.
Spock and a red shirt walk into a chemists bar.
Spock says, "I require a glass of H20."
The red shirt says, "I'll have H20 too."
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