The top documents tagged [elements unknown]

Periodic table

Periodic table

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Periodic Table

Periodic Table

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Chemical Periodicity. Chemists used properties of elements to sort them into groups 1829, J.W. Dobereiner’s classification system -elements in triads.

Chemical Periodicity. Chemists used properties of elements to sort them into groups 1829, J.W. Dobereiner’s classification system -elements in triads.

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