Yes, it is a pure substance but can be mixed with other gases.
It's a pure substance, and an element.
It is a colourless, odourless and tasteless, non toxic and inert gas, the first in the noble gas group in the Periodic Table.
Helium gas is a pure substance, but can be mixed with other gases to form a mixture.
Helium is a pure substance
Helium is pure as it is on the periodic table.
Helium is a pure substance
Helium gas is a pure substance
Helium gas is a pure substance
Helium gas is a pure substance
Helium is an element (and therefore a pure substance) yes
Helium is an element which makes it 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.
No. Helium is an element, which makes it a pure substance.
No, helium is a pure substance and an element to be more specific. It has a constant composition making it a pure substance and it is homoatomic (has only one type of atom) which makes it an element.
No, helium is a pure substance and an element to be more specific. It has a constant composition making it a pure substance and it is homoatomic (has only one type of atom) which makes it an element.