Helium is an element not a mixture.
Neither. Helium is not a mixture at all, it is a pure substance.
Neither. Helium is not a mixture at all, it is a pure substance.
Helium is gaseous but it is not a mixture - it is a chemical element.
A mixture of oxygen and helium is used in diving.
No. helium is an element. A mixture should have more than one substances.
Helium is an element.
Helium is a pure substance
No - it is an element all in itself. An example of a gas mixture is carbon dioxide, made of a mixture of oxygen and carbon. So helium is just helium; nothing mixed in with it.
Neither. Helium is an element
Helium is an element and not a compound or mixture.
It is a element
No. It will be a homogeneous mixture of gases.