Only a Few Grams of This Element Exist—and Scientists Have Used It to Break the Rules of the Periodic Table
More than 75 years after its initial discovery, scientists have created an organometallic molecule containing the ...
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118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic Number
There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...
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Periodic Table of Chemical Elements
organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. Scientists use the periodic table to quickly refer to information ...