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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
  • Number of elements in Mendeleev's periodic table is ...... elements
    67
  • The partition of periodic table that contains elements having similar proportion in vertical column.
    group
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