(1) It's boiling and melting points are lower than any other known substance
(2) It's the only element to exhibit superfluidity
(3) It's the only noble gas that does not form compounds with Flourine
(4) It's the only noble gas that cannot be solidified under standard conditions
(5) It's the second most abundant element in the universe
$\begin{array}{1 1} Only \;(3) \\ (2)\;and \;(3) \\ (1)\;and \;(3) \\ (1),(2)\;and \;(4) \end{array}$
