Unit 1

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Across
  1. 3. the area around the nucleus where electrons are most likely to be found
  2. 6. the horizontal rows on the periodic table
  3. 9. an atom with a positive electric charge
  4. 11. subatomic particle with no charge
  5. 15. this tells you the number of protons an element has
  6. 16. elements that have luster, are malleable, and ductile
  7. 17. the #protons + #neutrons
  8. 18. atoms are electrically ___
  9. 20. the vertical columns on the periodic table
Down
  1. 1. ___ electrons are in the outermost level
  2. 2. elements that are brittle and poor conductors
  3. 4. subatomic particle with a positive charge
  4. 5. the positively charged central part of an atom
  5. 7. subatomic particle with a negative charge
  6. 8. an atom that has an electric charge
  7. 10. the smallest part of matter that still retains the properties of that element
  8. 12. matter made of only one type of atom
  9. 13. an atom with a negative electric charge
  10. 14. elements found on either side of the staircase
  11. 19. most atoms are stable with this many valence electrons