Across
- 2. type of electron on the outside of an atom
- 7. type of gas that is unreactive
- 8. where the protons and neutrons are found in the atom
- 10. the number of electrons in the 2nd energy level
- 14. element that has properties of metals and nonmetals
- 15. 18 of them on the periodic table
- 17. most common type of element
- 20. "rings" around the nucleus that contain electrons
- 21. element has 8 valence electrons
Down
- 1. element that has 2 valence electrons
- 3. elements found in the upper right of the periodic table
- 4. 7 of them on the periodic table
- 5. example of a noble gas
- 6. type of "number" that give the number of protons
- 9. example of alkaline metal
- 11. example of transition metal
- 12. example of alkali metal
- 13. diagram to show where electrons can be found
- 16. Demetri Mendeleev is considered the _____ of the periodic table
- 18. element that has 6 valence electrons
- 19. example of a halogen group