periodic table

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Across
  1. 1. a positively charged subatomic particle in the nucleus of an atom
  2. 3. the elements that are good conductors of heat
  3. 5. a vertical group of elements on a periodic table
  4. 6. another name for group
  5. 9. particle found in the energy level of an atom
  6. 11. a negatively chargedperiodic law the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  7. 14. another name for period
Down
  1. 2. the center of atom
  2. 4. number the number of protons in the nucleus of an atom
  3. 7. smallest particle that has the properties of a element
  4. 8. elemnts that are usually poor conductors of heat
  5. 10. the horizontal rows of elements on the Periodic Table
  6. 12. level any of the possible energies an electron may have in an atom
  7. 13. a neutral subatomic particle in the nucleus of an atom