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8.5C Periodic Table of Elements Element Atomic Symbol Atomic Number Atomic Mass / Mass # amu Periods Groups Electron Shell Outermost Electron Shell Valence Electrons Metals Non-Metals Metalloids Noble Gas Reactivity A table showing the chemical elements arranged according to their atomic numbers A pure substance that cannot be separated into simpler substances by physical or chemical means; made of atoms that have the same properties as the element. A one or two letter notation used to represent an atom of a particular element The number of protons in the nucleus of one atom of an element The average mass of protons (P+) and neutrons (N0) in an element Stands for Atomic Mass Unit; is used to indicate mass on an atomic or molecular scale One proton (P+) has a mass of 1 amu one neutron (N0) has a mass of 1 amu. The rows in a Periodic Table that classify the elements by the number of electron shells ……… The columns on a Periodic Table that arrange the elements by the number of electrons that are in the outermost shell (valence electrons) A specific area where electrons (e-) of the same energy level are found Either filled or partially filled last energy level of an atom that determine the chemical properties of the atom; it is called the valence shell The electrons in the outermost energy level of an atom that influence how an element will react with other substances Most elements are metals. Properties include solid at room temperature, have a shiny luster, malleable, and good conductors of heat and electricity Elements on the right side of the Periodic Table; they tend gasses in their natural state, dull, brittle (not malleable) and poor conductors of heat and electricity Elements that have properties of both metals and nonmetals; sometimes referred to as semiconductors Unreactive nonmetals in Group 18 of the Periodic Table; they have a full valence shell The rate at which a chemical substance tends to undergo a chemical reaction Page 1 of 1