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10 Cards in this Set
- Front
- Back
Element
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Substance that cannot be broken down to other substances by chemical reactions.
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Compound
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Substance consisting of two or more different elements combined in a fixed ration.
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Atom
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Smallest unit of matter that still retains the properties of an element.
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Protons, neutrons, and electrons
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Protons-positive, neutrons-neutral, electrons-negative.
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Atomic nucleus
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Dense core that is packed together tightly with protons and neutrons.
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Dalton
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Unit of measurement used to measure atoms and subatomic particles.
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Atomic number
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Number of protons an element possesses.
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Mass number
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The sum of protons plus neutrons in the nucleus of an atom.
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Isotopes
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Atoms that have more neutrons than other atoms of the same element and therefore have greater mass.
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Radioactive isotopes
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Isotope that has a spontaneously decaying nucleus, giving off particles and energy.
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