Atomic Structure
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16 terms
Terms | Definitions |
|---|---|
 atom | the smallest particle of an element |
| electron | negatively charged particle; located outside the atomic nucleus |
| proton | a subatomic particle that has a positive charge and that is found in the nucleus of an atom |
| neutron | an elementary particle with 0 charge and mass about equal to a proton |
| atomic nucleus | An atom's central core, containing protons and neutrons. |
| NH3 | chemical formula for ammonia |
| C6H12O6 | The chemical formula for glucose |
| molecule | two or more atoms held together by covalent bonds |
| compound | a pure substance formed when two or more elements combine |
| chemical reaction | occurs when atoms or groups of atoms are recombined into new substances |
| buffer | a compound which resists changes in pH |
| isotope | one of two or more atoms with the same atomic number but with different numbers of neutrons |
| (atomic) nucleus | the core of an atom made up of protons and neutrons |
| ion | an atom or group of atoms that has a positive or negative charge |
| pH scale | measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14 |
| element | a pure substance made of only one kind of atom |
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