REVIEW CHP. 5 & 6

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Across
  1. 3. Two nuclei split apart
  2. 4. It's move around the nucleus
  3. 6. It's made of ice, dust and gases
  4. 7. Low mass and weak ionizing effect
  5. 10. The ability to remove electron from atoms become ions
  6. 12. the basic building blocks of matter
  7. 13. substance that consists of more than one type of element
  8. 15. One of the outer planet
  9. 16. Strong ionizing effect
  10. 17. small, heavy part of the atom
Down
  1. 1. The time required for a quantity to reduce to half
  2. 2. unstable isotopes
  3. 5. The movement of the earth rotating on its axis
  4. 8. They are outer planets.They move -----in space
  5. 9. The elements with the different number of neutron
  6. 10. they are rocky planets, solid and high density
  7. 11. Can stopped by lead
  8. 14. Different shape of the moon