Attempts of elements classification

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The most important attempts to classify elements are ………., ……………. and …………….

1) Mendeleev’s periodic table. 2) Moseley’s periodic table. 3) Modern periodic table.

Mendeleev discovered that the properties of elements were repeated ……………. by the beginning of each …………….

periodically - period

The first real periodic table for classifying elements.

Mendeleev's periodic table

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