"The properties of the elements are periodic function of their atomic numbers." This statement was given by:

The law of triads is applicable to a group of

State whether the following statements are true or false:
$(i)$ The first periodic table was proposed by Dobereiner.
$(ii)$ The law of octaves was proposed by Newlands in $1865$.
$(iii)$ Mendeleev was the first to propose the periodic law.
$(iv)$ Mendeleev named Eka-aluminium as Germanium and Eka-silicon as Gallium.

Mendeleev's periodic law is based on

What is the importance of the Periodic Table?

"The properties of elements are periodic functions of their atomic weights." This periodic law was given by