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Part A What are the coordination numbers of Li+ and S2? in the lithium sulfide crystal...

Part A

What are the coordination numbers of Li+ and S2? in the lithium sulfide crystal shown? Enter the values in order of Li+ and S2?, respectively.

Enter two integers separated by commas.

Part B

How many formula units are in the unit cell shown for Li2S?

Express your answer numerically as an integer.

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Answer #1

As there must be twice as many lithium ions as sulphide ions, the 'numbers' must be different.
It's 4:8. i.e. 4 sulphides around each lithium; and 8 lithiums around each sulphur.
It's an antifluorite structure. 4,8

Depends on where the ions are in the cell.
If the ion is at a corner, one-eigth belongs to that cell, because it's shared amongst eight cells.
If it's in the centre, it all belongs to that cell, because its not shared with any other cell.
If its along a side, one-quarter belongs toi that cell, because it's shared amongst 4 cells.   4

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