Question

the modern periodic table has been evolved through the early attempts of dobereiner,newland,mendeleev list advantage and limitation of all the three attempts​

Answer 1

Explanation:

advantages of dobereiner

1 . he tells that elements should be arrangd in increasing order of there atomic mass.

limitation

1.all the elements are not classified into group of traid on the basis of their properties.

advantages of newland

1. whenever the elements are arranged in increasing order of their atomic mass ,the properties of the eighth elements are the repitition of first elements

limitation

1. they are applicable till 20th element i.e calcium after this the properties of eighth elements does not match with the first one .

advantages of mendeleev

1.he kept vacant space for other elements that are yet to be discovered .

2. he was able to correct the value to atomic mass of element like gold and platinum by placing them strictly on the basis of their similarities in their properties .

limitation

1. he was unable to locate the position of hydrogen in the periodic table

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