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15
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Mendeleev discovered that the properties of elements were repeated ……………. by the beginning of each …………….
periodically - period
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15
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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.
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10
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The first real periodic table for classifying elements.
Mendeleev's periodic table
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5
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The partition of periodic table that contains elements having similar proportion in vertical column.
group
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thief
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15
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25
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magnet
Take 15 points!
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rocket
Go to first place!
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baam
Lose 20 points!
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5
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Number of elements in Mendeleev's periodic table is ...... elements
67
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