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A chemical compound is a chemical substance composed of atoms from more than one element held together by a chemical bond. All of the matter in the universe is composed of atoms of more than 100 different chemical elements found in pure form and combined. When new compounds form they have few, or sometimes even none, of the physical or chemical traits of the original elements, they have a new life on their own. There are millions of different compounds around you. Chemical changes in compounds happen when chemical bonds are created or destroyed.
Chemical bonds hold molecules together and create temporary connections that are essential to life. Common types of chemical bonds include covalent, ionic, and hydrogen bonds. Atoms tend to arrange themselves in the most stable pattern possible which means that they have a tendency to complete or fill their outermost electron orbits. The force that holds atoms together as molecules are referred to as a chemical bond.
Atoms are the basis for everything in the universe because all matter is composed of atoms. Solids are made up of densely packed atoms and gases have atoms that are more spread out. There are three basic parts of an atom: electrons, protons and neutrons. Electrons are the smallest of the three particles that make up atoms. Electrons are found in the shells, or orbitals, that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom. Each unique element has an atomic number equal to the number of protons it contains. Atoms can join together to form molecules which in turn form most of the objects around you. Different elements like oxygen and carbon contain different kinds of atoms. The atomic mass number is equal to the number of protons plus neutrons together.
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