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