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ES Ch 2.1


Element a pure substance that consists of entirely one type of atom
Atomic Number The number of protons in the nucleus of an atom
Energy Level region around the nucleus where electrons are located
Isotope An element with a different amount of neutrons. This changes the atomic mass.
Mass Number The number of neutrons and protons in an atom
Compound Chemical combination of 2 or more elements in definite proportions
Ionic Bond Chemical bond formed when one or more electrons are transferred from one atom to another
Covalent Bond A type of bond between atoms in which electrons are shared
Metallic Bond Metals form bonds with one another by sharing electrons
Molecule Smallest unit of most compounds that displays all the properties of that compound
Nucleus Center of an atom. Contains the protons and neutrons
Electron Negatively charged particle. Has 0 mass. Found in the space surrounding the nucleus.
Proton Positively charged particle. Has mass. Found in the nucleus.
Neutron Neutral particle. Has mass. Found in the nucleus.
Created by: Mrs.Stichter