Chemistry crossword

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Across
  1. 3. A substance that speeds up a reaction without being used up.
  2. 4. A horizontal row in the periodic table.
  3. 6. The force that holds atoms together.
  4. 7. A pure substance made of only one type of atom.
  5. 10. A substance made from two or more elements chemically joined.
  6. 12. Two or more atoms bonded together.
  7. 13. Two or more substances that are not chemically joined.
  8. 14. A soluble base with a pH above 7.
  9. 16. A particle in the nucleus with no charge.
  10. 17. The type of table that organises all the elements.
  11. 18. The centre of an atom containing protons and neutrons.
  12. 20. A vertical column in the periodic table.
  13. 21. A positively charged particle found in the nucleus.
  14. 22. A good conductor of heat and electricity.
  15. 23. A charged particle formed when an atom gains or loses electrons.
Down
  1. 1. A type of bonding where atoms share electrons.
  2. 2. A substance with a pH below 7.
  3. 5. Atoms of the same element with different numbers of neutrons.
  4. 7. A negatively charged particle that moves around the nucleus.
  5. 8. An element that is usually a poor conductor of electricity.
  6. 9. The smallest particle of an element.
  7. 11. A process in which new substances are formed.
  8. 15. A type of bonding formed by the transfer of electrons.
  9. 16. A substance with a pH of exactly 7.
  10. 19. The mass of a substance per unit volume.