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Chapter 15
Molecules & Compounds
| Term | Definition |
|---|---|
| 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
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