Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin, lead and mercury have been ... line in the diagram of the periodic table above separates the ...
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118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic NumberThere 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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