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Which number is missing?

Correct answers: 220

The first user who solved this task is Eric Newton.

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Joseph-Louis Proust

Died 5 Jul 1826 at age 71 (born 26 Sep 1754).French chemist who proved (1808) that the relative quantities of any given pure chemical compound's constituent elements remain invariant, regardless of the compound's source, and thus provided crucial evidence in support of John Dalton's “law of definite proportions,” which holds that elements in any compound are present in fixed proportion to each other.

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