CHEMISTRY

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Across
  1. 3. – The smallest particle of an element that retains its properties.
  2. 4. – A chemical link between two atoms.
  3. 7. – A negatively charged particle that orbits the nucleus.
  4. 8. – The lightest element in the periodic table.
  5. 10. – A substance with a pH less than 7.
Down
  1. 1. – A substance with a pH more than 7.
  2. 2. – Two or more atoms chemically bonded together.
  3. 5. – A gas essential for breathing.
  4. 6. – Anything that has mass and takes up space.
  5. 9. – What happens when substances chemically change.