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Chapter 15

Molecules & Compounds

TermDefinition
compound a substance whose smallest particles include more than one element chemically bonded together
mixture a substance that includes more than one type of element and/or compound that are not bonded together
chemical bond a bond formed between atoms through the sharing or transferring of electrons
covalent bond a type of chemical bond formed by shared electrons
molecule a group of atoms held together by covalent bonds
chemical formula identifies the number and element of each type of atom in a compound
ion an atom that has an electric charge different from zero. Ions are created when atoms gain or lose electrons
ionic bond a bond that transfers an electron from one atom to another resulting in attraction between oppositely charged ions
reactive an element readily forms chemical bonds
valence electrons electrons in the highest unfilled energy level of an atom. These electrons participate in chemical bonds
Lewis dot diagrams A dot diagram shows the element symbol surrounded by one to eight dots representing the valence electrons. Each dot represents one electron
valence (oxidation) number indicates the charge of an atom when an electron is lost, gained, or shared in a chemical bond
Created by: ddurham