| A | B |
|---|
| molecule | a COVALENTLY bonded substance; can be atoms of the same element (ex diatomic elements/molecules); molecular substance= covalent substance |
| compound | a substance composed of 2 or more atoms from different elements CHEMICALLY bonded together |
| bond | forces of attraction that hold atoms together in a molecule or compound |
| Octet Rule | atoms bond together in order to have 8 electrons in their valence shell |
| exothermic | energy is released as a product of a chemical reaction |
| endothermic | energy is consumed as a product of a chemical reaction |
| ionic bond | chemical bond involving the transfer of electrons between a metal and nonmetal atom (metals lose, nonmetals gain); electronegativity difference between elements typicall greater than 17 |
| covalent bond | chemical bond involving sharing of electrons between 2 nonmetal atoms; electronegativity difference between the elements typically less than 17 |
| oxidation number | the "charge" an element has within a compound |
| polyatomic ions | atoms of two or more elements chemically bonded together and having a NET CHARGE |
| stock system | system using Roman numerals(appearing in parentheses) after the element symbol to indicate the oxidation number of a TRANSITION METAL |
| binary compound | compound containing 2 elements |
| ternary compound | compound containing 3 elements |
| polar molecule | a covalent molecule with an unequal sharing of electrons; contains atoms of 2 different nonmetal elements( all covalent compounds that are not diatoms) |
| nonpolar molecules | a molecule with a symmetrical/equal sharing of electrons |
| intermolecular forces IMF's) | weak forces between molecules that hold the molecules to one another; not actually chemical bonds |
