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

Explain the "Law of Triads" with examples.

State whether the following statements are true or false:
$(i)$ The chart of elements presented by $Courtois$ could predict the stoichiometry of oxides of some metals.
$(ii)$ $Li, Na, Rb$ are known as $Döbereiner's$ triads.
$(iii)$ In $1863$,$Newlands$ classified the $56$ discovered elements into $18$ groups.
$(iv)$ $Mendeleev's$ periodic table is based on the atomic number of elements.

Whose name is not associated with the development of the Periodic Table?

What is the basic difference in approach between the Mendeleev's Periodic Law and the Modern Periodic Law?

Which of the following is a Dobereiner triad?