Across
- 5. Family 1, Period 2
- 6. Alkali metal in Period 4
- 8. between manganese and cobalt
- 9. nonmetal with 7 neutrons
- 13. Nobel gas with 2 neutrons
- 14. mass of 207 amu
- 15. has 29 protons
- 18. Atomic number equals 12
- 20. metalloid in period 3
- 21. has 6 protons
- 22. has only one electron
- 23. has 80 electrons
Down
- 1. halogen with 35 electrons
- 2. mass of 27 amu
- 3. atomic number equals 17
- 4. Family 4, Period 4
- 7. mass of 108 amu
- 10. between mercury and platinum
- 11. transition metal with 35 neutrons
- 12. has 16 protons
- 16. nonmetal with 8 neutrons
- 17. has 15 protons and 16 neutrons
- 19. transition metal with 28 protons
- 20. has 11 protons and 12 neutrons
- 21. Family 2, Period 4