Across
- 3. The weight of helium in grams
- 4. Element with the symbol of Br
- 6. Least radioactive element in period 3
- 8. The mass of carbon (No decimal Places)
- 11. Located in period 3, group 15
- 13. The symbol for Sodium
- 16. Electrons in the outer most shell
- 17. 1s2 2s2 2p1
- 18. Types of elements in the d-block
- 20. Amount of groups on the periodic table
Down
- 1. This group has two valence electrons
- 2. 1s1
- 5. The least radioactive group of elements
- 7. Has 80 protons
- 9. [Ar] 4s2 3d10
- 10. This group has 7 valence electrons
- 12. Has a mass of 9.012 grams
- 14. A vertical column on the periodic table
- 15. Mass of H3N in grams
- 19. Has a mass of 15.99 grams