Pure i belive. Allthough its a gass so its probably hard to find unmixed.
Helium is an element
Helium does not combine with other elements and pure helium will exist by itself as elemental helium.
Helium itself is an element and it forms no chemical compound whatsoever, therefore, it is a noble gas. The atom of Helium is so inert that it cannot even form a molecule with another atom of Helium, hence is monoatomic.
No it is not, helium is an element. A compound is a combination of two or more elements.
Helium is used as it is/pure. Helium is an inert gas and does not form part of compounds.
Helium does not combine with other elements and pure helium will not have carbon dioxide in it.
It is a element
A compound has minimum two different elements.
It is an element.
Helium is a gas, except at extremely cold temperatures.
A compound is 2 elements chemically combined, though it is unseparatable, it is made up of 2 or more elements. But since a compound cannot be broken down into elements, after the elements are chemically combined, that makes a compound a pure substance
Yes,elements and compounds are pure substance.
A pure substance is by definition composed of one compound. A compound may be composed of different elements.