Question

can we change the place of hydrogen, if yes then then why if no then how???????

Answer 1

Hydrogen has atomic no. 1 so is is placed in the first position(modern periodic table is based on atomic no. system)
Hydrogen has one electron in 1s orbital so it can loose that e- to form H+ cation like alkali metals so it is placed above group1.also it can form H- (hydride) like the halogens.so it can also be placed with them.generally H is observed to exist as H+ rather than H- so it is generally placed over grp1.
Still, the position of hydrogen is anomalous.

Answer 2

firstly hydrogen was in group 1 but it was removed from group 1 as all the element in the group 1 are metals but hydrogen is a non metal..

later it was put in the group 17 as all the element in the group 17 have one valence electron in their outermost shell,even hydrogen too has..but then it was removed from group 17 too as all the element in the group are noble gas.


but now hydrogen is a group by itself..so it's placed at the top of the periodic table