Chemistry · Periodic Classification of Elements
Who discovered in the year 1817 that when elements were arranged in groups of three, the relative atomic mass of the middle element was close to the average of the relative atomic masses of the other two elements?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1John Newlands
- 2A.E.B. de Chancourtois
- 3Dmitri Ivanovich Mendeleev
- 4Johann Wolfgang Döbereiner✓
Correct answer
Johann Wolfgang Döbereiner
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