write three feature of mendeleeve periodic table
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The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They 're numbered between 1 to 8.
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mendeleeve classified periodic table into horizontal rows and vertical columns horizontal rows are called as periods and vertical columns are called as groups. the elements with similar properties come in the same group
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