Chapter 9 - Lyla Nash

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Across
  1. 5. average mass of the naturally occurring isotopes of an element .
  2. 6. Tiny, very light particles, have a negative electrical charge (-), move around the outside of the nucleus
  3. 7. the number of protons for a given atom never changes, but the number of neutrons can change.
  4. 9. Large and heavy like protons, have no electrical charge, located in the nucleus of the atom
  5. 10. Much larger and heavier than electrons, have a positive charge (+), located in the nucleus of the atom
Down
  1. 1. any of the possible energies an electron may have in an atom.
  2. 2. number of protons in a neutral atom
  3. 3. an electron in the outermost energy level of an atom.
  4. 4. equal to the number of protons plus neutrons.
  5. 8. an atom that carries an electrical charge is called an ion