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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 of 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 most compounds |
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| a slight attraction that develops between the oppositely charged regions of nearby molecules |
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| attraction between molecules of the same substance |
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| attraction between molecules of different substances; in plants, the attraction between unlike molecules |
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| material composed of two or more elements or compounds that are physically mixed together but not chemically combined |
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| mixture of two or more substances in which the molecules of the substances are evenly distributed |
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| substance that is dissolved in a solvent to make a solution |
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| substance in which a solute is dissolved to form a solution |
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| mixture of water and nondissolved materials |
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| measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from O to 14 |
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| compound that forms hydrogen ions (H+) in solution |
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| compound that produces hydroxide ions (OH-) in solution |
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| weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH |
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