Question

Helium is a(n) _____.

1) compound.
2) heterogeneous mixture.
3) element.
4) homogeneous mixture.
5) electron.

Answer 1

Helium is an element, which is a pure substance consisting of only one type of atom, and thus cannot be a compound or a mixture.

Step-by-step explanation:

Helium is a pure substance that can be classified as an element. It is not a compound, as it contains only one type of atom, which cannot be broken down into simpler substances through chemical means. Helium is not a mixture because it is not a combination of different substances. Homogeneous and heterogeneous refer to types of mixtures, therefore they do not apply to helium. Furthermore, helium is definitely not an electron, which is a subatomic particle found in all atoms.