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.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

the temperature of the gas, in k, not celsius.