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| a substance that cannot be broken down into another substance by chemical reactions |
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| a substance consisting of two or more different elements combined in a fixed ratio |
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| anything that takes up space and has mass |
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| are elements required by an organism in only minute quantities |
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| the smallest unit of matter that still retains the properties of an element |
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| Neutrons, Protons, and Electrons |
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| Protons and electrons are electrically charged. A neutron is electrically neutral |
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| where protons and neutrons are packed tightly together in a dense core |
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| unit of measurement for atoms (same as atomic mass) |
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| the number of protons, which is unique to an element |
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| the sum of the protons plus the neutrons in the nucleus of an atom |
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| an approximation of the total mass for an atom |
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| different atomic forms of an element |
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| one in which the nucleus decays spontaneously, giving off particles and energy |
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| defined as the capacity to cause change |
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