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proton number

British  

noun

  1.  Z.  another name for atomic number

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The reaction is written The number at the lower left of each element symbol in the above reaction is the proton number.

From A Brief History of Element Discovery, Synthesis, and Analysis by Watson, Glen W.

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