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8th Grade

Reporting Category 1

TermDefinition
atom smallest particle of an element that maintains the properties of that element
mass number total number of protons and neutrons in a specific atom
atomic number the number of protons in the nucleus of an atom; determines the identity of an atom
electron cloud the negatively charged space containing electrons that surrounds the atomic nucleus
groups / families the vertical columns on the Periodic Table / those elements in the same vertical column have similar chemical properties
neutron neutral or no charge particle found in the nucleus / mass of 1 AMU
nucleus dense center of an atom composed of protons and neutrons / has a positive charge
periods horizontal rows on the periodic table / related to the number of energy levels
proton positively charged particle found in the nucleus / determines the identity of the atom
reactivity determined by the number of valence electrons / tendency of a substance to undergo a chemical reaction
valence electrons electrons in the outer energy level (electron shell)
subscript number written to the right of an element's symbol; represents the number of atoms of the element it is to the right of
coefficient the number placed in front of a chemical formula in a chemical equation; represents the number of molecules of that substance
precipitate the formation of solids formed during a chemical reaction
product substances produced from a chemical reaction
reactants substances that combine and change during a chemical reaction
Created by: user-1761509
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