Across
- 4. diffusion of water
- 6. energy for respiration
- 7. osmosis is the diffusion of this substance
- 8. the number of electrons in a neutral atom is equal to the number of ____
- 12. semi-conductors found along the stairstep on the periodic table
- 13. poor conductors, good insulators, often gases, found on the right side of the periodic table
- 14. molecule made of two atoms
- 17. tells us the amount of protons in an atom
- 18. highly reactive metals because they have one valence electron
- 21. when particles move from high to low concentration without requiring energy
- 23. charge of an electron
Down
- 1. where the protons and neutrons of an atom are found
- 2. is the combined mass of protons and neutrons
- 3. what water must pass across for osmosis to occur
- 5. a membrane that allows smaller molecules to pass, but not larger ones
- 9. elements that are nonreactive in nature with a full valence electron shell
- 10. greenhouse gas taken in by plants during photosyntheis
- 11. the force that holds molecules together
- 15. molecule made of two different types of atoms
- 16. often good conductors, lustrous, malleable, and possibly ductile
- 19. made of three types of subatomic particles
- 20. contents that contain a variety of non-bonded molecules
- 22. an atom with a charge due to unequal number of protons and electrons