Across
- 3. a place equipped for scientific research, experiments or testing
- 5. a material (like a metal) through which electricity and heat flow easily
- 6. the central part of an atom, which makes up 99.9% of the atom's mass
- 8. To speed Up
- 9. an atom or molecule that has an electric charge because it has either gained or lost electrons
- 10. a piece of iron or other material that attracts other pieces of iron or steel
- 12. something that has mass which can exist in the form of a solid, liquid, gas or plasma
- 15. a push or pull (There are four basic forces: gravitational, electromagnetic, strong nuclear and weak nuclear.)
- 17. an idea about the solution to a problem, based on knowledge and research
- 20. a series of actions carried out to test a theory, demonstrate a fact or find out what happens
- 21. a state of matter with definite volume but no definite shape, like water
Down
- 1. a positively charged particle found in the nucleus of an atom
- 2. a state of matter with definite shape and volume, like ice
- 4. the place on a magnet where the magnetic field is strongest
- 7. a closed path through which an electric current flows
- 11. the smallest unit of a chemical element, made up of a nucleus surrounded by electrons
- 13. the capacity to do work
- 14. the measure of the amount of matter an object has in it; measured in grams or kilograms
- 16. a state of matter with no definite shape or volume, like air
- 18. a tiny particle with a negative charge which orbits an atom's nucleus
- 19. a measurement of distance traveled over time (example: 100 kilometers per hour)