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Chem U3 Vocab

Chemistry Unit 3 Vocab lists 3.1 and 3.2

TermDefinition
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.
Created by: david.chavez
 

 



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