I'm quite stuck at suggesting formulas for compounds and such.
one question in the edexcel unit 1 exam said:
Which of the following formulae for compounds of germanium, Ge, is unlikely to be correct, given the position of germanium in the periodic table:
the answer is A but i'm not sure why!
Also, one said, suggest a formula of Gallium chloride and one answer is GeCl3 or Ge2Cl6.
Rep for best explanation.
Quick chemistry question. Please help !! Watch
- Thread Starter
- 29-12-2010 20:16
- 29-12-2010 20:56
i did this paper as a mock exam and i got it right due to my elimination process
Ge has a total of 32 electrons but only 4 is on the outer shell coz it's in group 4.
If Ge formed with F it would only have 7 electrons and therefore it would not obey the octet rule and so it's unlikely to form
- 29-12-2010 20:59
Germanium has got 4 electrons in it's outer most shell
F has 1 electron in it's outer most shell and there's three of them
If they form three covalent bonds in total you get 7 electrons
This is not completing the outer most shell, you need 8 to fill it up not 7.
That is why A is the answer
Did that help?Last edited by 16ARTER; 29-12-2010 at 21:07.
- 29-12-2010 21:14
Gallium trichloride exists as GaCl3 in the gas phase, and Ga2Cl6 in the solid phase, but I doubt they'd expect you to know that.