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| average of the masses of the existing isotopes of an element |
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| unit used to measure the masses of subatomic particles |
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| Number of protons in the nucleus of an atom |
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| Force of attration or repulsion between particles in an atom |
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| Negatively charged subatomic particle found in an area outside the nucleus of an atom |
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| Space in which electrons are likely to be found |
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| Most likely location in an electron cloud in which an electron can be found |
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| Force of attraction between all objects in the universe |
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| Atom of an element that has the same number of protons as another atom of the same element but a different number of neutrons |
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| Sum of the protons and neutrons in the nucleus of an atom |
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| Subatomic particle with no electric charge that is found in the nucleus of an atom |
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| Small, dense positively charged center of an atom |
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| Subatomic particle that has a positive charge and is found in the nucleus of an atom |
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| Particle that makes up all other known particles in the nucleus of an atom |
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| Force that binds protons and neutrons in the nucleus |
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| proton, neutron, and electron |
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| Force that is he key to the power of the sun; responcible for a process known as radioactive decay |
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