Usage History of 'anions'

The following chart shows how frequently 'anions' appeared in printed materials over time. For example, the word 'anions' occurred 2 times in books in 1592 and 31,347 times in 2008. From 1592 to 2008, the word 'anions' was used a total of 1,234,742 times in books scanned by Google. See Reference: Google Ngram project.

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