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Vocabulary Words Crossword Puzzle

Across
A chemical element with the symbol U and atomic number 92
A fast moving electron emitted by radioactive decay of substances
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
An outer shell electron that is associated with an atom
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
The name given to a horizontal row of the periodic table
A representation of the valence electrons of an atom that uses dots around the symbol of the element
(Of a magnetic pole or electric field) force (something similarly magnetized or charged) away from itself
It is used to describe where electrons are when they go around the nucleus of an atom
A nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy
A type of elementary particle and a fundamental constituent of matter
Down
The number of protons in the nucleus of an atom
An analogous transmutation of atomic nuclei or other particles
Exert a force on an object this is directed toward the source of the force
All existing matter and space
The smallest constituent unit of ordinary matter that consists a chemical element
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
The sum of the masses of its isotopes, each multiplied by its natural abundance
A tabular display of the chemical elements
The fixed amount of energy that a system described by quantum mechanics, such as a molecule,atom, electron, or nucleus can have
The total number of protons and neutrons in a nucleus
A helium nucleus emitted by some radioactive substances
The self sustaining fission reaction by neutrons which occurs in nuclear reactors and bombs
A set of elements occupying a column in the periodic table
Reproduction by means of a cell or organism dividing into two or more new cells or organisms
A stable subatomic particle with a charge of negative electricity
A particle that forms part of the nucleus of an atom and carries no electric charge
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge
The positively charged central core of an atom
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