[" The third period contains only eight elements "],[" even though the electron capacity of the third "],[" shell is "18" ."]

Give scientific reasons : The third period contains only eight elements even though the electorn capacity of the third shell is 18.

The third period contains _________ elements .

The period that contains only gaseous elements is

The last electron placed in the third(n=3) quantum shell for:

Period 1 contains _________ elements. (two/eight)

An element X belongs to the third period of the p- block elements. It has 4 electrons in the outermost shell. Name the element.