(1) When two helium atoms come close to one another, replusive forces overcome attractive forces
(2) All noble gases have 8 valence electrons
(3) Helium forms a compound with fluorine because of its closed shell configuration
(4) Helium is preferred to Hydrogen for filling gas balloons because its lighter and non-inflammable
Only(2)and(4)Only(3)and(4)(2),(3)and(4)(1),(2),(3)and(4)