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State two main properties of elements on...

State two main properties of elements on which Mendeleev's periodic classification was based.
Why position of hydrogen is not fixed in his periodic table ?

Text Solution

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(i) Physical properties of elements are periodic function of their atomic masses.
(ii) Similar formula of oxides and hydrides formed by elements of same group was selected as chemical property as basis of classification.
The atomic number of hydrogen is 1. Hence, it should occupy the first position in group 1 of the periodic table. But because of its chemical similarity with elements of group 1 and 17, the position of hydrogen in the periodic table is not fixed.
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