In the long form of the periodic table,the valence shell electronic configuration of $5s^2\,5p^4$ corresponds to the element present in

The electronic configuration of an element $M$ is given below: $M: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^{10} 4f^2 5s^2 5p^6 5d^{10} 5f^0 6s^2$. Choose the correct information regarding the element $M$ for its period number,block and group number respectively.

An element whose $IUPAC$ name is $Ununtrium$ $(Uut)$ belongs to

Match the following:

List-$I$	List-$II$
$A$. (Atomic number,$Z = 112$)	$I$. $s$
$B$. (Atomic number,$Z = 116$)	$II$. $p$
$C$. (Atomic number,$Z = 88$)	$III$. $d$
$D$. (Atomic number,$Z = 100$)	$IV$. $f$

The $IUPAC$ symbol for the element with atomic number $108$ is

Where is helium placed in the periodic table and why?