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8 Cards in this Set

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element
a material that cannot be broken down int anything simpler by chemical reactions.
element
a material that cannot be broken down into anything simpler by chemical reactions.
atom
the smallest unit of an element that retains the properties of that element.
nucleus
the center of an atom,it is made up of protons and neutrons.
proton
a particle with one unit of positive electric charge.
neutron
a particle with no electric charge it is neutral.
electron
particles with one unit of negative electric charge each.
molecule
particles with more than one atom joined together.