Science Crossword

1. atomic symbol = Fe
3. The maintenance of a constant internal environment, despite a changing external environment.
10. The back of the eye.
11. Electrical force, measured using a Voltmeter.
13. The best conductor of electricity.
15. Materials that heat/electricity can pass through easily.
16. Chemical messengers in the body.
17. Known as the 'love hormone'.
19. a long and slender projection of a nerve cell

2. A bundle of nerve fibres enclosed within a protective sheath.
4. A unit of electrical resistance.
5. Atoms that have the same number of protons, but a different number of neutrons.
6. The fifth element in the periodic table.
7. Atoms with a positive charge.
8. a form of energy/ the flow of electrons.
9. The only metal that isn't a solid at room temperature.
12. Found to the left of the zigzag line on the periodic table.
14. The atom that orbits the nucleus.
16. Atoms with no charge.
18. A charged particle that is the result of a loss/gain of electrons.