nature of matter

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Across
  1. 3. / the columns of the periodic table
  2. 5. / tiny particles, and rays that can destroy body cells
  3. 7. / made up of more than one atom, chemically combined
  4. 10. / the position is outiside the nuclues
  5. 14. / charge particle
  6. 15. / the forces between the particles are less strong
  7. 16. ONE / charge of proton
Down
  1. 1. MOLECULES / contain two atoms
  2. 2. / atoms of the same element having different masses
  3. 4. / smallest part of a substance
  4. 6. / charge is 0
  5. 8. / the rows of the periodic table
  6. 9. / particles are apart
  7. 11. / number of electrons in second shell
  8. 12. NUMBER / number of protons + neutrons inside the nucleus
  9. 13. / particles are close together