Chemistry; Atoms

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Across
  1. 2. Has a positive charge
  2. 4. The center of an atom
  3. 5. Adding or Subtracting + or - charge
  4. 9. Positive and negitive charged atoms
  5. 10. The rows across the Periodic Table
  6. 11. Electrons in their outmost energy level
  7. 15. Has a negative charge
  8. 16. To push each other away
  9. 17. The regions of electrons around the nucleus
  10. 18. Has no charge
  11. 19. The number of protons in the nucleus
  12. 20. Short-hand abbreviation for the element
Down
  1. 1. Two electrons from each atom are shared
  2. 3. Oppositely charged ions attract to each other
  3. 6. Made up of protons, neutrons, and electrons
  4. 7. Electrons that circle around the nucleus
  5. 8. The columns on the Periodic Table
  6. 9. Atom with same element but different number of neutrons
  7. 12. To move closer to each other
  8. 13. The average mass of the atoms in an element
  9. 14. Two bonded atoms