How many periods and groups are there in Mendeleev's periodic table?

Which scientist used atomic volume as the basis for the periodic classification of elements?

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

Which of the following information was not known at the time when Mendeleev's periodic table was constructed?

Describe Mendeleev's periodic table.

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.