atomic structure

123456789101112131415
Across
  1. 4. an elementary particle.
  2. 6. the outermost shell,energy level, atom.
  3. 10. organizes all discovered elements
  4. 13. negatively charged subatomic particle
  5. 14. any of various substances as gold, tin, copper
  6. 15. same number protons different numbers neutrons
Down
  1. 1. number of a element in periodic system
  2. 2. Russian chemist and teacher
  3. 3. the quantity of matter in an element.
  4. 5. a central figure of the atomic theory
  5. 7. structure in a cell that contains chromosomes.
  6. 8. helium, neon, argon, krypton, xenon, radon
  7. 9. chemical element forms salt when reacts metal.
  8. 11. The part of a substance that can't be broken down
  9. 12. a particle found in nucleus of every atom