Hannah Chapter 9

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Across
  1. 4. two atoms with different numbers of isotopes
  2. 5. mass number the number of protons plus nuetrons ions an atom that carries an electrical charge
  3. 8. tiny,very light particles, negative electric charge, and moves around the outside of the nucleus
  4. 9. heavy and large, positive charge, located in nucleus
  5. 10. any of the possible energies an electron may have in an atom
Down
  1. 1. indicates number of energy levels
  2. 2. an electron in the outermost energy level of an atom
  3. 3. highly reactive, too reactive to be found in nature, good conductors of heat and electricity
  4. 6. large and heavy, no electrical charge, located in the nucleus
  5. 7. shares similarities with those in your group and indicates valence electrons