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8 Cards in this Set
- Front
- Back
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Matter
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anything that takes up space and has mass
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Element
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a substance that cannot be broken down to other substances by chemical reactions
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Compound
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a substance consisting of two or more different elemebts combined in a fixed ratio
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Trace Elements
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Elements required by an organism in only minute quantities
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Atom
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the smallest unit of matter that still retains the properties of an element
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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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Atomic Mass
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the total mass of the nucleus
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Radioactive Isotope
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an isotope in which the nucleus decays spontaneously, giving off particles and energy
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