2SAS questions 13-25

13. a. horizontal

      b. family of elements

14. Hydrogen - H

      Potassium - K

15. a. Column VIII

      b. Noble gases boil at low temperatures

      c. Noble gases are gases at room temperature

16. a. MgF

      b. GaP

17. K - Approximately 60 degrees celsius

18. I would expect the boiling point to be higher.

19. a. C (Carbon)

      b. N (Nitrogen)

      c, d. 20 protons, 20 electrons

      e, f. Pt, 78 protons
      g, h. 92, 92

20. On Paper

21. A lead atom loses two electrons with 2+

22. a. C-12, N- 13, Ca - 41, Pt - 195, U - 238
      b. Carbon has two isotopes

23. The protons electrons and neutrons are not known.

24. An electron has a lighter mass

25. a, b. 12, 12
      c, d. 12, 13
      e, f. 12, 14