Science extra credit marking period 3

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