atom - The smallest neutral part of an element that can take part in chemical reactions., nucleus - The central part of an atom or ion., element - A simple substance made up of only one type of atom., electron - A tiny particle with a negative charge and very little mass., neutron - A particle found in the nucleus of an atom having zero charge and mass of 1 (relative to a proton)., proton - A particle found in the nucleus of an atom, having a positive charge and the same mass as a neutron., nucleon - A particle found in the nucleus (neutron or proton)., electron shell - Area around a nucleus that can be occupied by electrons. Shells are usually drawn as circles. Also called an energy level or an orbit., orbit - A word used to describe the way electrons move around the nucleus of an atom., mass number - The total number of protons and neutrons in the nucleus of an atom. It is also known as the nucleon number. (A), proton number - The number of protons in an atomic nucleus. Another term for atomic number., nucleon number - Another term for mass number., atomic number - The number of protons in the nucleus of an atom. It is also known as the proton number. (Z), isotope - Atoms of an element with the same number of protons (Z) but different mass numbers due to different numbers of neutrons., alpha particle - A particle made of two protons and two neutrons, emitted as ionising radiation from some radioactive isotopes., subatomic particle - A particle that is smaller than an atom, such as a proton, neutron or electron., electronic configuration - The arrangement of electrons in shells around the nucleus of an atom., ion - An atom or group of atoms with an electrical charge due to the gain or loss of electrons., positive ion - An atom that has lost electrons and so has an overall positive charge. Also called a cation.,

The Atom

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