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Chemistry miscellaneous
  1. Helium gas is filled in ballons because
    1. its atomic number is 2
    2. it is lighter than air
    3. it is one of the constitutents of water
    4. it is a noble gas
Correct Option: B

Helium is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. A wellknown but minor use is as a lifting gas in balloons and airships


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