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ATOMIC MASS-ATOMIC NUMBER VOCAB MATTER •anything that has mass and takes up space ELEMENT •a pure substance that cannot be broken down into other substances by chemical or physical means ATOM •the basic particle from which all substances are made CHEMICAL SYMBOL •short representation for the name of each element (ex: H is the symbol for Hydrogen) PERIODIC TABLE •a chart of all the elements arranged by atomic number, and as a result showing patterns of properties by columns ATOMIC NUMBER •the number of protons in the nucleus of an atom ATOMIC MASS •average mass of all the isotopes (different versions) of an element; sum of the protons and neutrons in an atom PROTON •positively charged particle that is part of an atom’s nucleus NEUTRON •a neutrally charged (no charge) particle that is part of an atom’s nucleus ELECTRON •a negatively charge particle that orbits the nucleus of an atom in the electron cloud PERIOD •a row of elements on the periodic table GROUP •a column of elements on the periodic table; share properties