Usage History of 'proton'

The following chart shows how frequently 'proton' appeared in printed materials over time. For example, the word 'proton' occurred 2 times in books in 1678 and 122,862 times in 2008. From 1678 to 2008, the word 'proton' was used a total of 4,434,829 times in books scanned by Google. See Reference: Google Ngram project.

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