element
Helium is an element
Neither. Helium is an element
No. Helium is an element, which makes it a pure substance.
Helium is an element. It is in the 18th group of the periodic table. It is a noble gas.
Helium is an element. It is a noble gas. It is in the 18th period.
Neither. Helium is a noble gas mono atomic element.
Helium is an element not a mixture.
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.
It is a element
Helium is an element.
Helium is a gas, except at extremely cold temperatures.
It is a element