Periodic Table Pastime

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Across
  1. 2. what elements can be represented by
  2. 7. the rows of the periodic table
  3. 8. positively charged subatomic particles
  4. 11. an atom that has lost of gained one or more electrons
  5. 13. group 17 on the periodic table
  6. 14. created the first periodic table
  7. 16. a group of elements on the periodic table with similar physical and chemical properties
  8. 18. what is matter made of
  9. 19. the columns of the periodic table
  10. 20. areas around the nucleus that contain electrons
Down
  1. 1. two or more atoms chemically combined
  2. 3. negatively charged subatomic particles
  3. 4. the amount of energy needed to remove one valence electron from an atom
  4. 5. how strongly an atom attracts a pair of electrons to itself when bonded with another atom
  5. 6. repeating patterns in the periodic table
  6. 9. neutral charged subatomic particles
  7. 10. group 18 on the periodic table
  8. 12. the distance from the center of the nucleus to the outermost energy level of an ion
  9. 15. what each type of atom is called
  10. 17. a force of attraction or repulsion caused by charged particles