Element - simple substances that cannot be broken down into simpler substances, Molecule - two or more atoms held together by bonds, Period - Horizontal row on the Periodic Table, Group - vertical column on the Periodic Table; elements in the column share similar properties; also known as a Family, Family - vertical column on the Periodic Table; elements in the column share similar properties; also knows as a Group, Conductivity - the ability of a material to allow either heat or electricity to flow through it, Pure substance - matter that has the same chemical composition throughout and cannot be separated into its parts by physical means; examples: elements and compounds, Solubility - the ability to dissolve in another substance, Malleability - the ability of a substance to be hammered or beaten into thin sheets, Homogeneous Mixture - a mixture in which substances are evenly distributed; example: a solution, milk, sugar water, Atomic Mass - total mass of the protons and neutrons in an atom, measured in atomic mass units. Found at the bottom of element box, Acid - Less than 7 on the pH scalee chemically with another substance, Base - Greater than 7 on the pH scale, Neutral - 7 on the pH scale, Precipitate - A solid that is produced as a result of a chemical reaction in solution, Atomic Number - the number of protons in the nucleus of an atom. Found in top of element box., Heterogenous Mixture - a mixture in which substances are not distributed evenly; example: a salad, pepperoni pizza, dirt, Metalloid - The staircase on the periodic table, Alkali Metal - First column of the periodic table, Alkali Earth Metals - Second column of the periodic table,

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