Helium is a pure chemical element.
Helium is pure as it is on the periodic table.
Helium is an element which makes it a pure substance.
No. Helium is an element, which makes it a pure substance.
It is an element.
Neither. Helium is not a mixture at all, it is a pure substance.
Helium is pure as it is on the periodic table.
Helium gas is a pure substance
Helium gas is a pure substance
Helium gas is a pure substance
Helium is an element which makes it a pure substance.
Yes, it is a pure substance but can be mixed with other gases.
No. Helium is an element, which makes it a pure substance.
It is an element.
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 a pure substance
Helium is an element a pure substance it is a chemical. It has properties eg it is a gas, it is colourless, it is odourless