Science crossword puzzle

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Across
  1. 5. what is family 3-12 name?
  2. 7. what is family twos name?
  3. 9. a basic building block of matter (makes up everything)
  4. 13. number the number of protons in the nucleus of an atom
  5. 14. mixture that you can see difference
  6. 17. Anything that takes up mass and space
  7. 18. a substance that consists of one atom
  8. 19. What is family 17 name?
Down
  1. 1. proton and neutrons (bottom number)
  2. 2. neutral
  3. 3. what is family 18 name?
  4. 4. 2 or more substances that psychically combined together
  5. 6. 4th state of matter
  6. 8. mixture that you cant see the difference
  7. 10. postie(+)
  8. 11. what is family ones name?
  9. 12. 2 or more substances that are chemically combined
  10. 15. negative (-)
  11. 16. an abbreviation for a chemical element