chemistry

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Across
  1. 4. a negative charge
  2. 5. the basic unit of elements
  3. 6. a change that can not be undone and gives off light, gas, heat,change of color, or forming of a precipitate
  4. 7. no charge
  5. 9. a substance formed during a reaction
Down
  1. 1. a change that can undone
  2. 2. consisting of different or diverse parts
  3. 3. consisting of the same parts
  4. 4. central core of the atom
  5. 8. a positive charge