Which type of substance is graphene? a-atom b- molecule c-compound will mark brainliest

B- molecule

Explanation:

An atom is the smallest entity of a substance which may or may not have independent existence.

Molecule is a pure substance which is composed of similar kind of  atoms.It can not be decomposed into simpler constituents using chemical reactions.Example: Hydrogen

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water

Graphene is a crystalline allotrope of carbon and thus is a molecule as it is made up of  similar kind of  atoms.

answer; 4 electrons;