Physical Science

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Across
  1. 2. This is what pulls atoms together and what causes the Earth to orbit the sun.
  2. 4. is an explosion in the event of a death of a star.
  3. 6. The smallest particle of a substance that has all of the physical and chemical properties of that substance.
  4. 8. atoms with no charge
  5. 9. is the basic unit of a chemical element.
  6. 10. positively-charged atoms
Down
  1. 1. negatively-charged atoms
  2. 3. is what Democritus called the atoms he thought they were indivisible.
  3. 5. equal or unequal sharing of electrons among the atoms of a molecule
  4. 7. building components of matter.