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118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic Number
Symbol: A one or two-letter abbreviation used ... the first 20 elements of the periodic table: H - Hydrogen He - Helium Li - Lithium Be - Beryllium ...
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Helium shortages: Should it be used for party balloons?
When this natural gas is extracted from deep underground, helium is collected as a by-product. Image source, Getty Images Image caption, 'He' is the chemical symbol for helium in the periodic ...