1st 40

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Across
  1. 2. The smallest unit of matter
  2. 4. Neutral particle found in the nucleus
  3. 7. Smallest unit of a compound
  4. 9. Hot ionized gas found in stars
  5. 10. State of matter with definite shape and volume
  6. 12. Center of the atom
  7. 13. Force that holds atoms together
  8. 15. A pure substance made of only one kind of atom
  9. 17. Positively charged particle in the nucleus
  10. 19. Two or more elements chemically combined
Down
  1. 1. Atom with same protons but different neutrons
  2. 3. A blend of two or more substances not chemically combined
  3. 5. State of matter with no fixed shape or volume
  4. 6. Negatively charged particle orbiting the nucleus
  5. 7. Amount of matter in an object
  6. 8. State of matter with definite volume but no shape
  7. 11. Atom with a positive or negative charge
  8. 14. Mass divided by volume
  9. 16. Table where all known elements are arranged
  10. 18. Space an object occupies