Across
- 2. how much mass does an electron have
- 4. how many electrons are in the 3rd energy level
- 5. located in the center of the atom and the electron cloud that surrounds it
- 6. determine the reactivity of an element
- 9. how many electrons are in the 2nd energy level
- 10. electrons are located in this
- 12. the smaller part of an element
- 13. neutrons have a what charge
- 14. and atom has how many subatomic particles
- 15. protons have a what charge
- 17. how many areas does a atom have
- 18. run up and down in columns on the periodic tablell
Down
- 1. located in the nucleus and have a neutral charge
- 3. properties of both metals and nonmetals
- 4. arrange themselves into rings called energy levels
- 7. what charge do electrons have
- 8. how many electrons are in the 1st energy level
- 11. the amount of rings around the nucleus
- 15. located in the nucleus and have a positive charge
- 16. what is the mass of a proton and a neutron