ATOM - Smallest particle of an element that can exist. Makes up all matter. , ATOMIC NUMBER - The number of protons in the nucleus of an atom, which determines its place in the periodic table., ATOMIC MASS - The mass of an atom usually expressed in atomic mass units, ELECTRON - Subatomic particle with a negative charge, PROTON - Subatomic particle with a positive charge, NEUTRON - Subatomic particle with no charge (neutral), ENERGY LEVEL - Where electrons are found in an atom, VALENCE ELECTRON - Outermost electrons (play a role in bonding), IONIC BOND - Type of bond when electrons are transferred , COVALENT BOND - Type of bond when electrons are shared, ION - Form when atoms gain or lose electrons, PERIOD - Each row on the periodic table (represents the number of energy levels), GROUP - Each column on the periodic table (elements in the column have the same number of valence electrons) , REACTANT - Left side of a chemical equation before the chemical reaction occurs, PRODUCT - Right side of a chemical equation representing the new substance formed, YIELDS - Represented by an arrow in a chemical equation shows a chemical reaction is occuring, COEFFICIENT - A number added to balance an chemical equation, BALANCED - When the mass on both sides of a chemical equation are equal, UNBALANCED - When the mass on both sides of a chemical equation are not equal, LAW OF CONSERVATION OF MASS - Atoms are not CREATED or DESTROYED during a chemical reaction, just rearranged. , ELEMENT SYMBOL - The letter that represents element on the periodic table, SUBSCRIPT - The numbers that come after a symbol and below. It tells you the number of atoms of that element. , METAL - Elements on the left side of the stair-step line (majority of elements on the periodic table), NONMETAL - Elements on the right side of the stair-step line, ANION - Negative ion, CATION - Positive ion, MOLECULE - Two or more atoms held together by a chemical bond,

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