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| The basic particle from which all elements are made. |
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| The central core of the atom. |
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| A positively charged particle that is part of an atom's nucleus. |
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| A small particle in the nucleus of the atom, with no electrical charge. |
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| A negatively charged particle that is found outside the nucleus of an atom. |
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| The number of protons in the nucleus of an atom. |
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| A unit of measurement for the mass of articles in atoms. |
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| The electrons that are in the highest energy level of an atom and that are involved in chemical reactions. |
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| A chart of the elements showing the repeating a pattern of their properties. |
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| Elements in the same vertical column of the periodic table. |
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| A horizontal row of elements in the periodic table. |
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| A molecule consisting of two atoms. |
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