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