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| An uncharged subatomic particle contained within the nucleus of an atom; similar in mass to a proton. |
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Definition
| The dense centre of an atom; part of an atom containing all of the positive charge and almost all of the mass of the atom. |
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Definition
| Two electrons together in an electron shell. |
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Definition
| A property of a substance that can be observed through the senses, measured, or calculated. |
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Definition
| A positively charged subatomic particle contained within the nucleus of an atom; has an electric charge of +1; stable when outside of the nucleus. |
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Definition
| A substance that has identical properties in every sample; also called a substance. |
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Definition
| Any of the parts that make up the atom; includes electrons, protons, and neutrons. |
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