Particles, density, radiation

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Across
  1. 2. this is the number of electrons you can fit in the first shell
  2. 5. this particle has a positive charge and is found in the nucleus
  3. 6. the half-life is the time it takes for the amount of radiation to decrease by ...
  4. 7. an isotope has the same number of protons but a different number of ...
  5. 9. to calculate the density of an object you do mass divided by...
  6. 10. this type of radiation is a wave and has no charge
  7. 12. this element has the symbol 'Cu'
Down
  1. 1. this particle has a negative charge and orbits the nucleus in shells
  2. 3. to work out the volume of an irregular shape you put it into a special type of can called a eureka or ...... can
  3. 4. this type of radiation has a charge of -1
  4. 5. this element has the symbol 'K'
  5. 8. this element has the symbol 'Na'
  6. 11. this type of radiation has a charge of +2