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8th Grade Chemistry Vocabulary

Electron Shell A specific area where electrons of the same energy level are found
Element A pure substance that cannot be separated into simpler substances by physical or chemical means
Atom The smallest unit of an element that has all of the properties of that element containing a nucleus within an electron cloud
Proton A positively charged subatomic particle in the nucleus of an atom and contributes to the mass of the atom
Electron A negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds
Neutron The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons
Nucleus The very dense region consisting of protons and neutrons at the center of an atom
Atomic Symbol A one- or two-letter notation used to represent an atom of a particular element
Amu unit Amu stands for atomic mass unit and is used to indicate mass on an atomic or molecular scale
Valence electrons The number of electrons with which a given atom generally bonds or number of bonds an atom forms
Electron shells A grouping of electrons surrounding the nucleus of an atom



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