Question

(a) State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed ?
(b) Explain why, the noble gases are placed in a separate group.

Lakhmir Singh Chemistry Class 10

Answer 1

Hey !

Here is your answer !

a) According to Mendeleev’s periodic law: The properties of elements are a periodic function of their atomic masses. It was the discovery of atomic number which led to a change in Mendeleev’s periodic law which was based on atomic mass.
(b) The noble gases are placed in a separate group because they are chemically very inert or unreactive (having completely filled outermost electron shells).

Answer 2

Answer:

periodic law on which mendeleev periodic table was based..

Explanation:

the the properties of elements are a periodic function of their atomic masses.