No. Helium is an element, which makes it a pure substance.
Neither. Helium is not a mixture at all, it is a pure substance.
Helium is pure as it is on the periodic table.
Helium is an element
Helium is an element which makes it 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.
Helium gas is a pure substance
Helium gas is a pure substance
Helium gas is a pure substance
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.
Neither. Helium is an element
Helium is pure as it is on the periodic table.
Helium is an element
element
Helium is an element which makes it 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 a noble gas mono atomic element.