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| one of the elements in Group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium) |
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| one of the elements in Group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium) |
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| the smallest unit of an element that maintains the properties of that element |
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| the mass of an atom expressed in atomic mass units |
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| a unit of mass that describes the mass of an atom or molecule |
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| the number of protons in the nucleus of an atom |
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| a subatomic particle that has a negative charge |
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| a region around the nucleus of an atom where electrons are likely to be found |
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| a vertical column of elements in the periodic table |
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| one of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); halogens combine with most metals to form salts |
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| an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass) |
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| the sum of the numbers of protons and neutrons in the nucleus of an atom |
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| a subatomic particle that has no charge and that is found in the nucleus of an atom |
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| one of the elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon) |
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| in physical science, an atom's central region, which is made up of protons and neutrons |
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| a horizontal column of elements in the periodic table |
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| describes something that occurs or repeats at regular intervals |
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| the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the element |
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Definition
| a subatomic particles that has a positive charge and that is located in the nucleus of an atom |
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