Non-metals include hydrogen, carbon, nitrogen, oxygen, phosphorous, selenium and sulfur. The non-metals consist of elements in groups 14, 15 and 16 on the periodic table of elements. They include both solids and gases. More » Science Chemistry Atoms & Molecules

Non-porous surfaces include glass, processed metals, leather and plastics, and they are further divided into rough and smooth surfaces. Non-porous smooth surfaces include glass and painted or varnished surfaces. Non-poro... More »

Non-metallic minerals are minerals that have no metallic luster and break easily. These are also called industrial materials and are typically some form of sediment. Non-metallic minerals are not malleable. More »

Plastics are comprised of a combination of elements such as carbon, silicon, nitrogen, oxygen, sulfur, chlorine and hydrogen. Carbon atoms form the backbone of most plastics, except the silicones, which have silicon as t... More »

Every type of lipid contains oxygen, hydrogen and carbon, but a specific type known as a phospholipid also contains phosphate and nitrogen. All of the lipids are considered organic compounds due to the presence of carbon... More »

Although the chemical composition of wood varies from species to species, wood is primarily composed of carbon, hydrogen, oxygen, calcium, potassium, sulfur, nitrogen and magnesium. Most wood contains some amount of wate... More »

Organic compounds contain carbon, and almost all organic compounds contain hydrogen, with many also comprised of additional atoms of nitrogen, oxygen or sulfur. Not all compounds that contain carbon, however, can be cons... More »