A) they are mono atomic
B) they are found in abundance
C) the size of their atom is very small
D) they are completely paired up and have stable electrons shells
Correct Answer: D
Solution :
In general, noble gases are not very reactive, their chemical inertness is due to the fact that they have completely filled \[n{{s}^{2}}n{{p}^{6}}\]electronic configuration of their valence shells. The other reasons are very high ionization enthalpy and almost zero electron affinity.
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