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Tuesday, July 9, 2013

2SAS p.131- 132 #13 -25

13) a) period
      b) family or group

14) a) K potassium & Na sodium

15) a) the rightmost group on the periodic table
      b) boil at low temperatures
      c) nonreactive

16) a) MgF2
      b) GaP

17) (98 + 39) / 2 = 68.5°C 

18) I would expect chlorine to have a lower boiling point then Idoine because of the pattern, the lower atomic number ones useually have a lower boiling point.

19) a) carbon 12
      b) carbon 13
      c) 20 protons
      d) 20 electrons
      e) platnum
      f) 78 protons
      g) 92 protons
      h) 92 electrons

20) a) 1) 4 protons
          2) 4 electrons
          3) 5 nutrons
      b) 1) 7 protons
          2) 7 electrons
          3) 7 nutrons
      c) 1) 10 protons
          2) 10 electrons
          3)  10 nutrons

21) The student was wrong because the atom really lost two electrons because you can't gain or lose protons.

22) a) 1) carbon 12
          2) carbon 13
          3) calcium 41
          4) platinum 195
          5) uranium 238
     b) carbon

23) No, you also need the atomic number

24) The mass of the electron is 1/ 2000 the mass of a proton or neutron

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

     





     

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