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| the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities |
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| negatively charged particle; located outside the atomic nucleus |
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| substance consisting entirely of one type of atom |
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| atom of an element that has a number of neutrons different from that of other atoms of the same element |
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| substance formed by the chemical combination of two or more elements in definite proportions |
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| link that holds together atoms in compounds |
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| bond formed when one or more electrons are transferred from one atom to another |
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| atom that has a positive or negative charge |
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| bond formed by the sharing of electrons between atoms |
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| Smallest unit of of most compunds |
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