Question

a)The modern periodic table has been evolved through the early attempts of Dobereiner and Newland and Mandeleev. List one advantage and one limitation of all three attempts.
b) Name the scientist who first of all showed the atomic number of an element is a more fundamental property than its atomic mass.
c) State Modern periodic law.

Answer 1

ans a)- since the elements are to be classified according to there atomic number which will be comfortable for studying whereas these tries are according to there atomic mass

ans b)- mendeleeve is the first scientist to say that

ans c)- the elements are the periodic properties of their atomic masses

Answer 2

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