Periodic table crossword

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1234567891011121314151617
Across
  1. 2. number the total number of protons and neutrons in the nucleus of an atom
  2. 3. family group 18 or 8A
  3. 5. another name for group
  4. 7. family group 17 or 7A
  5. 9. a negatively charged subatomic particle found in the energy level of an atom
  6. 12. law the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  7. 13. a positively charged subatomic particle in the nucleus of an atom
  8. 14. another name for period
  9. 16. the center of an atom; made up of protons and neutrons
  10. 17. vertical column of elements ranging from 1-18
Down
  1. 1. mass unit a quantity equal to one-twelfth the mass of a carbon-12 atom
  2. 2. the elements that are good conductors of heat and electricity
  3. 4. family group 1 or 1A
  4. 6. an element that has the properties of both metals and non metals
  5. 8. any atoms having the same number of protons but a different number of neutrons
  6. 10. a neutral subatomic particle in the nucleus of an atom
  7. 11. metal the elements that are usually poor conductors of heat and electricity
  8. 15. horizontal row of elements ranging from 1-7