Atomic Structure, Isotopes, Nuclear Radiation

123456789101112131415161718
Across
  1. 5. Energy level where electrons are found.
  2. 6. Negatively charged particle found around the nucleus.
  3. 9. Material containing unstable nuclei that emit radiation.
  4. 11. Electromagnetic radiation with the greatest penetrating power.
  5. 12. Number of protons in an atom.
  6. 14. Atoms of the same element with different numbers of neutrons.
  7. 15. Atom with no overall charge.
  8. 17. Another name for electron shell.
  9. 18. Positively charged particle found in the nucleus.
Down
  1. 1. Element commonly used to explain isotopes such as carbon-12 and carbon-14.
  2. 2. Substance made of only one type of atom.
  3. 3. Property of particles that can be positive, negative or neutral.
  4. 4. Type of radiation stopped by thin aluminium.
  5. 7. Centre of an atom containing protons and neutrons.
  6. 8. Particle in the nucleus with no charge.
  7. 9. Energy or particles emitted from an unstable nucleus.
  8. 10. Charged particle formed by gaining or losing electrons.
  9. 12. Smallest particle of an element that can exist.
  10. 13. Total number of protons and neutrons in an atom.
  11. 16. Type of radiation stopped by paper and highly ionising.