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2016-03-15T13:36:58+05:30

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At first Mendeleev created a periodic table on the basis of atomic mass. But it had some drawback

So the modern  periodic table was created using the idea of Mendeleev just changing the basis from atomic mass to atomic number.
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2016-03-15T13:43:47+05:30

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Atomic number is  the basis of morden periodic table

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