Usage History of 'tetravalent'

The following chart shows how frequently 'tetravalent' appeared in printed materials over time. For example, the word 'tetravalent' occurred 2 times in books in 1868 and 1,933 times in 2008. From 1868 to 2008, the word 'tetravalent' was used a total of 71,487 times in books scanned by Google. See Reference: Google Ngram project.

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