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Vocabulary Words Crossword Puzzle

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Across
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A chemical element with the symbol U and atomic number 92
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A fast moving electron emitted by radioactive decay of substances
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Each of two or more forms of the same element that contains equal number of protons but different numbers of neutrons in their nuclei; a radioactive form of an element
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An outer shell electron that is associated with an atom
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Either of the two antipodal points where the earth's axis of rotation meets the earth's surface(North Pole and South Pole); either of the two regions at the extremities of a magnet to which the lines of force converge or from which they diverge
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The name given to a horizontal row of the periodic table
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A representation of the valence electrons of an atom that uses dots around the symbol of the element
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(Of a magnetic pole or electric field) force (something similarly magnetized or charged) away from itself
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It is used to describe where electrons are when they go around the nucleus of an atom
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A nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy
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A type of elementary particle and a fundamental constituent of matter
Down
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The number of protons in the nucleus of an atom
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An analogous transmutation of atomic nuclei or other particles
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Exert a force on an object this is directed toward the source of the force
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All existing matter and space
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The smallest constituent unit of ordinary matter that consists a chemical element
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An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
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The sum of the masses of its isotopes, each multiplied by its natural abundance
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A tabular display of the chemical elements
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The fixed amount of energy that a system described by quantum mechanics, such as a molecule,atom, electron, or nucleus can have
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The total number of protons and neutrons in a nucleus
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A helium nucleus emitted by some radioactive substances
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The self sustaining fission reaction by neutrons which occurs in nuclear reactors and bombs
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A set of elements occupying a column in the periodic table
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Reproduction by means of a cell or organism dividing into two or more new cells or organisms
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A stable subatomic particle with a charge of negative electricity
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A particle that forms part of the nucleus of an atom and carries no electric charge
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A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge
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The positively charged central core of an atom
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A substance introduced into a biological organism or other system so that it’s subsequent distribution can be readily followed from its color, fluorescence, radioactivity, or other distinctive property