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12 Cards in this Set
- Front
- Back
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atom
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the basic structural unit of an element. The smallest unit of an element that still retains the chemical properties of that element.
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parts of an atom
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electrons, protons, neutrons, nucleus
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nucleus
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a small, dense, positively charged region in the center of the atom. Made up of protons and neutrons.
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electron
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negatively charged and located outside the nucleus. Move rapidly in a large volume of space.
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proton
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positively charged and has equal magnitude with electrons.
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neutral atom
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number of electrons: in a stable (neutral atom) they are equal to protons. Has no charge.
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atomic number
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number of protons
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mass number
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sum of protons and neutrons
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number of neutrons
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mass number - atomic number
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number of electrons
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number of protons, if the atom is positively charged
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isotopes
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-atoms of the same element having different masses.
-Same number of protons, different number of neutrons. -same chemical properties, different physical properties. -some isotopes are radioactive |
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ions
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protons do not equal electrons
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