Question

Which of the following is the correct sequence of the noble gases in their group in the periodic table?

• A. $Ar,He,Kr,Ne,Rn,Xe$
• B. $He,Ar,Ne,Kr,Xe,Rn$
• C. $He,Ne,Kr,Ar,Xe,Rn$
• D. $He,Ne,Ar,Kr,Xe,Rn$

Answer 1

The correct option is D $He,Ne,Ar,Kr,Xe,Rn$

Sequence of the noble gases is in increasing order of atomic number

$He=2$, $Ne=10$, $Ar=18$, $Kr=36$, $Xe=54$, $Rn=86$

Option D is correct.