Homework #2

p130 # 13 - 25

13.
 a. group
 b. family

14. K - Potassium
      Na - Sodium

15. The first column on the right side has the noble gases.
All noble gases freeze at low temperatures.
Every noble gas doesnt really react.

16.
a. MgF2
b. GaP2

17. 60°C

18.  Chlorine would have a lowering boiling point simply because it is a pure gas.
Iodine has a higher boiling point because it is a solid at room temperature.

19. a. Carbon
      b. Carbon
Calcium - 20 protons/electrons
      e. Platinum (78 protons)
Uranium - 92 protons/electrons

20. Beryllium - 4 protons/electrons 5 neutrons
Nitrogen - 7 protons/electrons 7 neutrons
Neon - 10 protons/ electrons 10 neutrons

21. Wrong because atoms dont lose or gain protons, only electrons.

22. a.Berylliums mass number is 9. Nitrogen 14. Neon 20
      b. Beryllium

23. We dont know if its physical or chemical because there is not suffcient info given.

24. the electron is so small you dont need to measure weight.

25. 24 - 12 p/e
      25 - 13 p 12 e
      26. 13 p/e