periodic table vocabulary

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Across
  1. 2. symbol for atomic mass unit
  2. 6. a region in an atom where there is a high probability of finding electrons
  3. 8. a negatively charged subatomic particle found in the energy level of an atom
  4. 9. level any of the possible energies an electron may have in an atom
  5. 11. the smallest particle that has the properties of an element
  6. 12. any atoms having the same number of protons but a different number of neutrons
  7. 13. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
Down
  1. 1. the center of an atom; made up of protons and neutrons proton a positively charged subatomic particle in the nucleus of an atom
  2. 3. the elements that are usually poor conductors of heat and electricity
  3. 4. a neutral subatomic particle in the nucleus of an atom
  4. 5. number the number of protons in the nucleus of an atom
  5. 7. the elements that are good conductors of heat and electricity
  6. 10. number the total number of protons and neutrons in the nucleus of an atom