In most cases, back pain will improve in a few weeks or months, although some people experience long-term pain or pain that keeps coming back. Types of back pain Backache is most common in the lower back ('lumbago'), although it can be felt anywhere along your spine, from your neck down to your hips.
Graphene is made of a single layer of carbon atoms that are bonded together in a repeating pattern of hexagons. Graphene is one million times thinner than paper; so thin that it is actually considered two dimensional. Carbon is an incredibly versatile element.
Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above. The two balls represents the two oxygen molecules.