Question

(a) The modern periodic table has been evolved through the early attempts of

Dobereiner, Newland and Mendeleev. List one advantage and one limitation of

all the three attempts.

(b) Name the scientist who first of all showed that atomic number of an element is a

more fundamental property than its atomic mass.

(c) State Modern periodic law.​

Answer 1

Answer:

a)Mendeleeff

There was place for every element unlike that of early chemists.

The limitation was there was no place for isotopes of the common elements, rare earth metals and certain other elements.

b)Moseley was the scientist.

c)According to modern periodic law: Physical and chemical properties of elements are periodic function of their atomic number.