Bralon crossword

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Across
  1. 2. Two or more things mixed together, but not chemically joined.
  2. 4. What holds atoms together.
  3. 7. Two or more atoms stuck together.
  4. 9. An atom or group of atoms with a charge.
  5. 10. A pure substance made of only one kind of atom.
  6. 12. Something you start with in a chemical reaction.
  7. 13. A way to measure how concentrated a solution is.
  8. 14. How much mass is packed into a certain space.
  9. 16. A substance with a pH less than 7.
  10. 17. The electrons in the outer shell of an atom.
  11. 18. A mixture where one thing dissolves in another.
  12. 19. A substance made from different elements joined together.
Down
  1. 1. Something made in a chemical reaction.
  2. 3. Atoms of the same element with different numbers of neutrons.
  3. 4. A substance with a pH greater than 7.
  4. 5. A particle with no charge in the nucleus.
  5. 6. A positive particle in the nucleus.
  6. 8. Connected to the repeating pattern on the periodic table.
  7. 11. The smallest piece of an element.
  8. 15. A negative particle that moves around the nucleus.