Matter and energy

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Across
  1. 2. a force that is created by humans or friction
  2. 5. a formula that shows the chemicals representation
  3. 7. the number that is given to an element to make it easier to find on the periodic table
  4. 9. a table of the chemical elements
  5. 10. positive particle
Down
  1. 1. a letter that represents an element which is also used in a chemical formula
  2. 3. smaller than or occurring within an atom.
  3. 4. a physical substance you can feel
  4. 6. negative particle
  5. 8. neutral particle