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