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Chem U3 Vocab
Chemistry Unit 3 Vocab lists 3.1 and 3.2
| Term | Definition |
|---|---|
| E=mc2 | Mass-energy equivalence; a small change in mass results in a large change in energy. |
| Electrostatic Repulsion | Force which pushes objects of like charges away from each other. |
| Nucleon | Nuclear particle of an atom; protons and neutrons are the two types. |
| Nuclear Fission | Process in which an atomic nucleus splits to form smaller parts (lighter nuclei) |
| Nuclear Fusion | Process in which two or more atomic nuclei collide at a very high speed and join to form a new atomic nucleus |
| Strong force | Short range attractive interaction between protons and neutrons; holds the nucleus together. |
| Nucleus | Dense region consisting of nucleons (protons and neutrons) at the center of an atom |
| Alpha (α) Decay | A 2-proton, 2-neutron particle is emitted from an atomic nucleus. Resulting mass number is 4 less, and atomic number is 2 less. |
| Beta (β) Decay | An electron or a positron is emitted from an atomic nucleus. Parent/daughter mass numbers are equal. |
| β— Decay | Emission of an electron from the nucleus of an atom. Results in an increase in atomic number but no change in Mass Number (neutron à proton). |
| β + Decay | Emission of a positron from the nucleus of an atom. Results in a decrease in atomic number but no change in Mass Number (proton à neutron). |
| Gamma (ɣ) Decay | A high-energy particle (light) is emitted from an atomic nucleus. |
| Radioactive Decay | Process by which a nucleus of an unstable atom loses energy by emitting particles of ionizing radiation. |
| Isotope | Different versions of the same element. Same number of protons, different number of neutrons; may be radioactive. |
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david.chavez
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