Final answer:
Graphene remains flexible at low temperatures due to its structure consisting of sp²-hybridized carbon atoms, which form a flat monolayer with strong covalent bonds and delocalized electrons.
Step-by-step explanation:
Graphene remains flexible at very low temperatures with the help of carbon atoms. Like graphite, graphene is composed of a layer of six-membered rings with sp²-hybridized carbon atoms forming the corners. Each carbon atom in graphene forms strong covalent bonds with three neighboring carbon atoms in a trigonal planar arrangement, and the delocalization of electrons, or resonance, across the structure adds to its stability and flexibility, even at low temperatures. In stark contrast to graphite, graphene consists of a single atom-thick layer, which does not have layers stacked atop one another, giving it unique and impressive properties.