List one advantage and limitations of all the three attempts (earlier) of classification of elements.
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Dobereiners triads - arranged elements into triads such that the middle element was the arithmetic mean of the other 2 elements.
limitation - his law is not applicable to all elements
Newlands law of octaves - when 8 elements are arranged in increasing order of their at. mass , every eight element beginning from any resembles the 1st element in its phy and chem properties.
limitation - his law is not applicable to all the elements
Mendeleev : The physical and chemical properties of elements are the periodic function of their atomic mass.
limitation: he couldn"t explain the position of isotopes and rare earth metals.
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