| Term | Definition |
|---|
| Atoms | the smallest unit of an element |
| Elements | an atom with a specific number of protons |
| Molecules | two or more atoms bonded together |
| Chemical Formula | the symbol that stands for an element |
| Chemical Reaction | new material formed by the rearrangement of atoms |
| Balanced Chemical Equation | a chemical equation where both the reactants and the products contain the same amount of atoms for each element |
| Electrostatic Force | the force of opposite charges that attract one another |
| Atomic Number | the number of protons in an atom |
| Mass Number | the combined number of protons and neutrons in an atom |
| Atomic Weight | the average mass number of all isotopes of an element |
| Protons | positively charged part of an atom |
| Neutrons | part of an atom with no charge |
| Electrons | negatively charged part of an atom |
| Nucleus | the center of an atom, contains the protons and neutrons |
| Isotopes | two or more atoms whose nuclei contain the same amount of protons, but different numbers of neutrons |
| Ions | an atom or group of atoms with a positive or negative charge |
| Valence Electrons | electrons that lie on the outer shell (orbital) of an atom. |
| Anions | atoms that tend to lose electrons (negative charge) |
| Cations | atoms that tend to gain electrons (positive charge) |
| Positive Valence | atoms that lose electrons |
| Negative Valence | atoms that gain electrons |
| Polyatomic Ions | a group of atoms bonded together that have a net positive or negative charge |
| Mole | 6.022 * 10^23 (602,200,000,000,000,000,000,000); the number of atoms in a certain amount of each atom or molecule This amount (in grams) is equal to the atomic weight or formula mass or an atom or molecule |
| Molar Mass | same as formula mass, unit in grams |
| Formula Mass | the combined atomic weights of all atoms in a molecule |
| pH | measures the level of acid in a substance |
| Sodium Azide Reaction | 2 NaN3 --> 3 N2 + 2 Na |
| Ionic Bonds | the bond between two or more ions that are of opposite charge |
| Dissociation | ionic compounds splits or breaks apart |
Combine with other sets
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