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Periodic Puzzle

Across
the central and most important part of an atom
the number of atoms in an object
subatomic particle with a charge of negative electricity
a substance that takes part in and undergoes change during a reaction
an electron of an atom, located in the outside shell of the atom
subatomic particle with a positive electric charge
Down
a vertical column in the Periodic
subatomic particle of about the same mass as a proton but without an electric charge
where electrons are when they go around the nucleus of an atom
a substance that is formed as the result of a chemical reaction
horizontal row of the periodic table