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

Which of the following is a Dobereiner's triad?

Given below are the atomic masses of the elements:

Element	$Li$	$Na$	$Cl$	$K$	$Ca$	$Br$	$Sr$	$I$	$Ba$
Atomic Mass $(g \cdot mol^{-1})$	$7$	$23$	$35.5$	$39$	$40$	$80$	$88$	$127$	$137$

Which of the following does not form a $Dobereiner's$ triad?

What is the periodic table according to Glenn $T$. Seaborg?

Match the following and select the correct option.

List-$I$	List-$II$
$(1)$ Lothar Meyer	$(A)$ First to present a periodic table showing correct arrangement up to Calcium.
$(2)$ $A$.$E$.$B$. de Chancourtois	$(B)$ Arranged elements in horizontal and vertical rows based on atomic weight.
$(3)$ Newlands	$(C)$ Discovered the element with atomic number $101$.
$(4)$ Seaborg	$(D)$ Suggested that arrangement based on atomic weight is an important concept in the periodic table.
	$(E)$ Presented the first possible periodic table.
	$(F)$ Arranged elements into groups of three.
	$(G)$ Law of Octaves.

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.