Which pair of elements fits into same slot in Newlands’ table of elements ?

Law of octaves was proposed by

The predicted properties of elements Eka boron, Eka aluminium and eka silicon were close to the observed properties of the following elements respectively.

The abnormal pair of elements in the following is

The set of elements that is not Dobereiner triad from the following

Mendeleeff’s eka aluminium is

A Dobereiner triad in the following is

………….. found that each element emits a characteristic pattern of X- rays when subjected to bombardment by high energy electrons.

Modern periodic table is based on

The number of periods and groups in modern periodic table …………

……….. elements are called Lanthanides.

Lanthanides having atomic numbers from ……………… to ……………

5 f elements are called ………………

Noble gases belong to ……………… group of periodic table.

The elements present in 2nd period of long form of periodic table :