Question

collect the information about reactivity of 8A group elements(noble gases) from various sources and prepare a report on their special character when compared to other elements of periodic table.

Answer 1

Examples of elements are;Helium(Z=2),Neon(10),Argon(18),Krypton(36),Xenon(54)&Radon(86).
Following the exact rule of electronic configuration and explained properties,noble gases have a valence of 0.Shells are all filled with paired electrons in all energy states possible.No any form of energy state available to get a new electron.Neither the nucleus allows the an electron to go out.The ionization energy seems to be high.There are inert and they don't react with other elements in the periodic table.They are single atom molecules.It is found not long ago that they too form compound.At least some of them do.
Helium electrons are held closely to the nucleus as it is a very  small atom.The outermost electrons are in the principal quantum number n=6 in the Radon.That is very far.The radius of the atoms increase proportional(roughly for an idea)to square of n.Thus the outermost electron are loosely bound as compared to Helium.So its ionization energy is less.