An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Z-number
  عدد ِ اتمی  
adad-e atomi (#)
Fr.: nombre atomique  

Same as → atomic number.

See also: Z, from the German word Zahl “number, numeral, figure,” which was used to specify an element’s numerical place in the → periodic table; → number.