unit 3 crossword

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Across
  1. 2. a outermost electron of an atop that participates in chemical bonding
  2. 4. a element that has physical and chemical properties of both metals and non-metals
  3. 8. a element that has no metallic properties
  4. 10. atom around anomic nucleus while a electron is most likely to be heated
  5. 11. the sum of the number of protons and neutrons in an element
  6. 13. a particle with one negative charge (-1)
  7. 15. most of the atoms mass and positive charge is concentrated in a small atom in the center of an atom
  8. 17. the smallest piece of an element that represents that elements electron
  9. 18. the number of protons in an atom of an element
  10. 20. a chart of the elements arranged in rows and columns according to their physical and chemical properties
Down
  1. 1. the average mass of the elements isotopes, weighted according to the abundance of eat isotope
  2. 3. the elements in group 18
  3. 5. atoms of the same element that have different numbers of neutrons
  4. 6. rows on the periodic table
  5. 7. a force that holds two or more atoms together
  6. 9. a atom particle that has one positive charge (+1)
  7. 12. a model that represents the valence electrons in an atom as dots around the elements chemical symbol
  8. 14. a element in group 17 of the periodic table
  9. 16. a column on the periodic table
  10. 19. a neutral particle that exist in the nucleus of an atom