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| The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule. |
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| The central part of most cells that contains genetic material and is enclosed in a membrane. |
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| A very small particle of matter that has negative charge of electricity and that travels around the nucleus of an atom. |
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| One of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances. |
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| Any of the categories of antibodies determined by their physicochemical property and antigenic characteristics that occur in all individuals of a species. |
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| A substance formed by the chemical combination of two or more elements in definite proportions. |
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| A chemical bond formed between oppositely charged species because of their mutual electrostatic attraction. |
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| An atom or group of atoms that has a positive or negative electric charge from losing or gaining one or more electrons. |
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| A chemical bond formed between atoms by the sharing of electrons. |
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| The smallest possible amount of a particular substance that has all the characteristics of that substance. |
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| A slight attraction that develops between oppositely charged regions of nearby molecules. |
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