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Which important property did Mendeleev u...

Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?

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Increasing atomic mass and similarity in chemical properties of elements were the two criteria used by Mendeleev to classify the elements. He took the formulae of the oxides and hydrides formed by the elements as the basis for classification of elements.
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In his periodic table, Mendeleev arranged all the then known 63 elements in the order of increasing atomic masses in horizontal rows but in such a way that element having similar properties came directly under one another in the same vertical column. In the classification of the then known elements, Mendeleev was guided mainly by two factors. In order to make sure that the elements having similar properties fell in the same vertical column, Mendeleev left some gaps in his periodic table. Though the leaving of gaps in the periodic table was considered to be a big drawback of his classification of elements at that time but Mendeleev stuck to his decision. (a) What are the horizontal rows of Mendeleev's periodic table known as? How many horizontal rows of elements were there in Mendeleev's original periodic table? (b) What are the vertical columns of Mendeleev's periodic table known as? How many vertical columns were there in Mendeleev's original periodic table? (c) What were the similar properties used by Mendeleev to classify the then known elements into vertical columns? (d) What were the two main guiding factors for Mendeleev in the classification of the then known elements? (e) For what purpose were some gaps left by Mendeleev in his periodic table ? Does the modern periodic table also have the gaps left by Mendeleev? Explain your answer. (f) What values were displayed by Mendeleev in presenting his classification of elements?

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