The Periodic Table

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Across
  1. 3. The number of protons in the nucleus of an atom
  2. 6. Determining the age or date of an organic matter by looking at its proportions of carbon
  3. 9. A subatomic particle that exists in the nucleus and has a positive charge
  4. 11. A particle that is smaller than an atom
  5. 13. The time taken for radioactivity to get to half of its original value
Down
  1. 1. A subatomic particle in the nucleus that has a negative charge
  2. 2. A subatomic particle in the nucleus that has a neutral charge
  3. 4. Two or more forms of the same element which have the same number of protons however a different number of neutrons
  4. 5. The total number of protons and neutrons in a nucleus
  5. 7. When elements spontaneously emit energetic particles by the disintegration of the nucleus
  6. 8. The smallest part of a substance
  7. 10. All substances are made of atoms and the same substance will have the same type of atom which are all identical
  8. 12. A substance that has a mass and takes up space