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a particle with two protons and two neutrons, has a 2+ charge, is equivalent to a helium-4 nucleus. Is emitted during radioactive decay.
radiation that is made up of alpha particles; is deflected toward a negatively charged plate when radiation from a radioactive source is directed between two electrically charged plates
radiation that is made up of beta particles; is deflected toward a positively charged plate when radiation from a radioactive source is directed between two electrically charged plates
radiation that originates from the cathode and travels to the anode of a cathode-ray tube
a negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and moves through the empty space surrounding an atom's nucleus
a pure substance that cannot be broken down into simpler substances by physical or chemical means
high-energy radiation that has no electrical charge and no mass, is not deflected by electric or magnetic fields, usually accompanies alpha and beta radiation, and accounts for most of the energy lost during radioactive decay
a neutral, subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton
a type of equation that shows the atomic number and mass number of the particles involved
the extremely small, positively charged, dense center of an atom that contains positively charged protons and neutral neutrons
a chart that organizes all known elements into a grid of horizontal rows (periods) and vertical columns (groups or families) arranged by increasing atomic number
the rays and particles - alpha and beta particles and gamma rays - that are emitted by radioactive materials
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