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Unit 1, Section 3

Model A simplified representation of something more complex, that facilitates understanding certain aspects of a real object or process
Atoms The smallest unit of an element that retains the chemical properties of that element
Nucleus The dense, positively charged structure found in the center of the atom. It is composed of protons and neutrons
Proton A particle with a positive charge, found in the neucleus of atoms
Electron A particle with a negative charge. Electrons more very fast around the outside of the nucleus of atoms.
Neutron A particle that does not have a charge found in the nucleus of atoms
Radioactive Isotopes Any isotope that gas an unstable nucleus and decays over time
Nuclear Reaction A process that involves changes the nucleus
Radioactive Decay A spontaneous Process by which an atom emits radiation or particle to become more stable
Fusion The joining of two nuclei to form a larger nucleus accompanied by a release of energy
Fission The splitting apart of an atomic nucleus into two smaller nuclei accompanied by a release of energy
Alpha Particle A particle composed of two protons and two neutrons, equivalent to the nucleus of a helium atom
Beta Particle An electron emitted from the nucleus of an atom during beta decay
Gamma Ray A form of high energy electromagnetic radiation emitted during nuclear reactions
Alpha Decay Nucleus losses helium, 2 the left
Beta Decay Neutron turns into proton, move to the right
Created by: LanaB