Answer
Common properties of Noble Gases are as follow: -
a. They have generally very low reactivity, except Xenon.
b. They are odorless and colorless.
c. They are poor conductor of heat and electricity.
(ii) Radon is radioactive
(iii) Helium is used instead of hydrogen in balloons. Its advantage is that it is non-flammable. The disadvantage is that it is scarce gas and costly as compared to hydrogen.
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