the modern periodic table has been evolved through the early attempt of dobereiner,Newland and Mandeleev. list advantage and disadvantage of all the three attempts
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dobereiner traits ecetion is his law vaild only for lither elements
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marit of doberenar is traid rule and demarit is it is not 4 all drawback of new is it is not valid after calcium and mand is position of isotope
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