Science extra credit marking period 3

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Across
  1. 2. a substance only made of one element
  2. 3. C on the periodic table
  3. 6. a substance mixed together with two or more subtances
  4. 7. the number of protons and neutrons in an atom
  5. 9. particles that make up protons, Neutrons, and electrons
  6. 10. atom with a negative charge
  7. 11. atoms with the same amount of protons but a different amount of neutrons
  8. 13. part of an atom with electrons
  9. 16. o on the periodic table
  10. 17. an atom made up of more than 1 element
  11. 18. part of an atom with protons and neutrons
Down
  1. 1. a table that lists all element
  2. 2. Positively charged particle
  3. 4. mass of an atom
  4. 5. Model of an atom Named after the person who made it.
  5. 8. Particle with no charge
  6. 12. Particle with negative charge
  7. 14. h on the periodic table
  8. 15. an atom only made of itself