atoms and elements

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Across
  1. 2. charge, the energy shown as either (+) or (-).
  2. 3. are pure substances made up of only one type of atom.
  3. 9. their building blocks are made of 2 or more different types of atoms.
  4. 10. the centre of the atom.
  5. 13. are very small particles that make up all matter.
  6. 14. a small group of atoms joined together.
Down
  1. 1. number, the number of protons in an atom.
  2. 2. are not found in the nucleus, but spin fast around it in area of empty space (e-).
  3. 4. number, the total number of particles in the atom's nucleus.
  4. 5. have no electrical charge.
  5. 6. roughly 1800 times heavier than electrons and located at the centre of the atom.
  6. 7. are found in the centre of the atom and often shown as p+.
  7. 8. elements, man made elements.
  8. 11. reaction, the chemical changes by which atoms gain, lose or share electrons.
  9. 12. each element has its own, they can come from their ancient names or common names.