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Atom The smallest particle of an element, made of electrons, protons, and neutrons.
Nucleus The tiny, very dense, positively-charged region in the center of an atom; made up of protons and neutrons.
Electron Cloud The area surrounding the nucleus of an atom where the electrons are found.
Electrical Charge A property of matter; electrons are negatively charged; protons are positively charged; the numbers of protons and electrons in a material determine the charge of the material.
Proton, p+ A positively-charged subatomic particle of the nucleus of an atom that contributes to the mass of the atom.
Neutron, n0 A subatomic particle of the nucleus of an atom that is without charge that contributes to the mass of an atom.
Electron A negatively-charged subatomic particle that orbits the atomic nucleus.
Subatomic Particles Particles that are smaller than the atom.
Element A pure substance that cannot be separated into simpler substances by physical or chemical means.
Atomic Number The number of protons in the nucleus of a single atom.
Chemical Symbol A one or two letter notation used to represent an atom of a particular element.
Atomic Mass The mass of an atom, approximately equal to the number of protons and neutrons in the atom.
Created by: Doerre052605