Core of Things - Revision!!

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Across
  1. 1. Form of electromagnetic radiation, most energetic form and barely affected by air
  2. 5. Materials that do NOT allow electron to flow through them easily.
  3. 7. A group of atoms bonded together by chemical bonds
  4. 8. Fundemental building block of all matter
  5. 9. Abosorbed in about 100cm of air
  6. 10. Atom of the same element with different mass numbers
  7. 12. Made up of two or more substances which are not chemically combined
  8. 13. They consist of two or more elements and are chemically combined together
  9. 15. Particle in the nucleus that is neutrally charged
  10. 18. Materials that ALLOW electrons to flow through them easily
Down
  1. 2. Particles consisting of two protons and two neutrons tightly bound together, absorbed in a few centimetres of air
  2. 3. Particle in the nucleus that is positively charged
  3. 4. A basic pure substance that cannot be broken down into simpler substances
  4. 6. A stationary electrical charge that is built up on the surface of a material
  5. 11. A specific type of pure matter consisting of either one type of atom or molecule
  6. 14. Particle in the nucleus that is negatively charged
  7. 16. The centre of the atom and stores the Neutron and proton
  8. 17. Electrical connect between a device or a sustem and the earth, path for electrical current to flow in event of fault to protect people