Atoms and ions

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Across
  1. 1. two or more elements that have transferred electrons to join together
  2. 4. the centre of the atom that contains protons and neutrons
  3. 8. a negatively charged subatomic particle
  4. 9. the building blocks of all matter
  5. 11. the thing you do to help you remember things for a test
Down
  1. 2. the rows of the periodic table are called
  2. 3. the number that tells us how many protons an atom contains
  3. 5. a piece of matter made up of only one type of atom
  4. 6. an atom that has gained or lost electrons leaving it charged
  5. 7. the columns of the periodic table are called
  6. 10. the number that tells us how many things are in the nucleus