Across
- 3. what is the name of group 1
- 5. What is the heaviest actinide
- 8. What is a variation of a element called
- 9. what is the same as atomic number
- 10. What is the separating staircase called
- 14. what’s another name for period number
- 15. Positive ions have_protons than electrons
- 16. 5th group, 7th period
- 17. what element has the abbreviation of Tc
- 20. Germanium has how many valence electrons
Down
- 1. name for needing eight valence electrons
- 2. group 17 name
- 4. what defines the different types of isotopes in a element
- 6. vertical organization of valence electrons
- 7. standard measurement for mass
- 11. what block is Sm in
- 12. What is chlorine 24
- 13. avg mass of 114.818
- 18. what is the first coinage element
- 19. what is the hyphen notation of chlorine