2SAS Questions 13-25

13. A). Row: Period

      B). Column: Group

14. Sodium (Na), Potassium (K)

15. A). All elements listed in the rightmost column
      B). They are all inert gases 
      C). They are nonreactive

16. A). MgF
      B). GaP

17. 19 degrees celsius and 39 degrees celsius

18. Lower because it weighs less

19. 

20. A). 4 protons, 4 electrons, and 5 neutrons
       B). 7 protons, 7 electrons, and 7 neutrons
       C). 10 protons, 10 electrons, and 10 neutrons

 21. The lead atom must have lost two protons to make the ion

22). A). Carbon: 12.01
              Nitrogen: 14.01
              Calcium: 40.08
              Platinum: 195.08
              Uranium: 238.03
        B). Platinum and Uranium

23). No it's not without the element because the element is needed to weigh it's mass

24). Electron has the least mass of all the three

25).