While it is not a "Noble Gas" it is much lighter than air. It is not lighter than Hydrogen, but it does not ignite as easily.
No
CFC's are useful to man. They act as coolants.
helium is chemically inert and has no chemical properties
make it into something useful
Helium is inert. There are no known compounds. It has no chemical properties.
as it is costlier . Less useful than what?
Helium is lighter than air (which means it can be used to make stuff float, like balloons) and a noble gas (which means that it won't react with other elements). Both of these qualities make helium very useful.
- it is a practically inert gas
Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
Its transparent (see through).
because it is?gjkl#
dunnnoo m8