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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 ...
Nature12d
The Optical Spectrum of Hafnium
DURING the progress of the work of Coster and Hevesy on the concentration and isolation of the new element hafnium (atomic number 72), the discovery of which was announced in NATURE of January 20, p.