The modern periodic table has been evolved through the early attempts of
Dabereiner, Newland and Mendeleev. List one advantage and one limitation of
all the three attempts.
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1) Doberiner
in Doberiner triad we can see that the sum of other two element is approximately the mean of middle element so it was easy to calculate the mean and its type
The limitataion of Doberiner triad is that all the middle were not approximately the mean of other two elements
2) the Newland octave state that every eight element has the similar chemical and physical properties that of the first
The newland law was only applicable till the element calcium
3)the mendelev periodic table was based on atomic mass and were arranged in an increasing order of the atomic mass
the two isotopes were kept in single box
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