Unit 2 SAS #13-25 (pg. 131)

13. a. periods
      b. groups/families

14. a. Sodium - Na
      b. Potassium - K

15. a. The noble gases are located on the right side of the table.
      b. All of the elements are monatomic. 
      c. All of the elements are very unreactive. 

16. a. MgF2
      b. GaP3

17. 68.5 degrees C

18. I would think that the boiling point of chlorine would be higher that iodine because chlorine is higher up on the periodic table. 

19. a. Carbon
      b. Nitrogen
      c. 20
      d. 20
      e. Platinum - 95
      f. 78
      g. 92
      h. 92

20. a. 4 protons, neutrons, and electrons
      b. 7 protons, neutrons, and electrons
      c. 10 protons, neutrons, and electrons

21. Instead of gaining 2 protons, the student should have said that the atoms lost to electrons. 

22. a. Carbon - 12                     b. Carbon and Nitrogen
      b. Nitrogen - 13
      c. Calcium - 41 
      d. Platinum - 195
      e. Uranium - 238

23. The mass number given is not enough information to characterize the element because we don't know how many protons or neutrons are in the mass number. 

24. The mass of an electron is 1/2000 of a proton or neutron. 

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