Chemistry

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Across
  1. 4. (of a bond)sharing a pair of electrons
  2. 6. a chemical element found in all living things, existing in a pure state as diamond
  3. 8. a quality or characteristic that something has
  4. 9. physical substance that everything in the world is made of
  5. 10. the part of an atom that contains most of its mass and that carries a positive electric charge
Down
  1. 1. the process of a liquid changing or being changed into a gas
  2. 2. a group of atoms that forms the smallest unit that a substance can be divided into without a change in its chemical nature
  3. 3. an occasion when two or more people or things communicate with or react to each other
  4. 5. that is very strong and cannot easily be destroyed
  5. 7. a substance formed by a chemical reaction of two or more elements