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Definition
| The smallest particle of an element that can enter into a chemical reaction. |
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| Substances that cannot be broken down or decomposed into simpler substances by chemical means. |
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Definition
| A substance composed of 2 or more elements that are chemically combined in definite proportions by mass. |
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Definition
| A compound or an element; material in which the composition is the same throughout. |
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Definition
| The average mass of all the isotopes in a sample of an element. |
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Definition
| Atom of an element that has a specific number of protons and neutrons. |
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Definition
| The total number of protons and neutrons in the nucleus of an atom. |
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Definition
| When the electrons of an atom occupy higher energy levels while lower energy levels are vacant. |
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Definition
| An atom or ion in which the electrons occupy the lowest available energy levels. |
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Definition
| Combinations of 2 or more substances that can be separated by physical means. |
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| A mixture in which the substances are not uniformly mixed. |
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Definition
| A substance in which the particles are uniformly mixed. |
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Definition
| The current model of the atom that deals with the wave particle duality of nature. |
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Definition
| A region in an atom which an electron of a particular amount of energy is most likely to be located. |
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Term
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Definition
| The electrons in the outermost energy level of an atom. |
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