Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table. why?
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helium is placed in in right of periodic table because it is nobel gas it's valency is 0 so it is placed in zero group and zero group is far right of the table
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We know that helium is a second element which is placed on the far right of the periodic table.
It is also nonmetallic gas. It is placed so far from hydrogen because its physical and chemical properties are equal to the elements which are present in group 18. It has the second least atomic number and mass number after hydrogen.
The elements following the helium are all termed to be inert gases (group 18). These elements have a completely filled configuration which means their valency is zero.
Also they are highly stable and they don't form compounds.
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