1.

The modern periodic table has been evolved through the ear$ attempts of Dobereiner, Newland and Mendeleev. List one advantages and one limitation of all the three attempts.

Answer»
AdvantagesLimitation
DobereinerProperties of elements in each triad were similar.Only three triads were identified. Triads for all known elements were not prepared.
NewlandThe properties of the first element is similar to the eighth element It was only applicable upto Calcium. Rest of the elements were not discovered.
MendeleevIt was easy to study the physical and chemical properties of various elementsThe position of hydrogen was not assigned. The position of isotopes was not certain.



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