Sceince

2. movement of heat by water and air
4. small particle of matter that has a negative charge
6. potential difference across a conductor
7. transfer of heat by electromagnetic waves
9. a group of atoms bonded together
10. is the horizontal raw of the periodic table
11. unit of measure of the rate of a electron flow or current in an electrical conductor
13. transfer of energy by direct contact only with solids
14. the group 18 of the periodic table is called_________
15. a substance whose atoms all have same number of protons
17. space where there is no matter
18. neutral subatomic particle that is constitued of every atomic nucleus except ordinary hydrogen
19. a charged atom or molecule
20. is the vertical column of the periodic table

1. machine that converts electrical energy into mechanical energy
3. waves tahta re created as a result of vibrations between an electric field and a magnetic field
5. the concentration of a force
8. subatomic particle that has a positive charge
12. the smallest particle of a chemical element that can exist
16. effect a force may cause by an object to turn abut a pivot