Bonnie Branch MS 8th gr- 3-1 Inside the Atom
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| nucleus | the central core of an atom containing protons and usually neutrons
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| proton | small positively charged particle in the nucleus of an atom
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| neutron | small uncharged particle in the nucleus of an atom
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| electron | a tiny, negatively charged, high-energy particle that moves in the space outside the nucleus of an atom
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| atomic number | the number of protons in the nucleus of an atom
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| atomic mass unit (amu) | a unit of measurement for the mass of particles in atoms (1 neutron = 1 amu & 1 proton = 1 amu)
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| valence electrons | the electrons that are farthest away from the nucleus of an atom and involved in chemical reactions (the
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| electron dot diagram | a representation of the number of valence electrons in an atom using dots placed around the symbol of an element
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| isotope | an atom with the same number of protons and DIFFERENT NUMBER OF NEUTRONS from other atoms of the same element
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