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May 8th, 2017, 02:28 AM   #1
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Unit Cells

Hi, i've attached the questions i'm having trouble with.

https://www.dropbox.com/s/8wzphmxla312je0/c.png?dl=0
https://www.dropbox.com/s/2xoswl3heqbnvqt/a.png?dl=0

I've attached two pictures.
I understand the one that is titled 'face centred cubic: example of NaCl'. I just attached it incase it helps in finding the solution to the other question.

The other attachment is titled 'Crystalline solids'

I dont understand what it means by 'front face of the unit cell'. Does that just mean one side of the cube? When it says 'how many unit cells share each of the Na+ ions...', does it mean how many unit cells are next to each of the Na+ ions?

Also, in the answer explanation, what does it mean by 'including the pictured cell'? I think the reason that I cant get the correct answer is because i dont understand what they are trying to ask.
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