Metallic gold crystallises is fcc lattic...

Metallic gold crystallises is fcc lattice .The length of the cubic unit cell is 4.242 Ã…. The closest distance between two gold atoms is:

`4 Ã…`

`3 Ã…`

`2 Ã…`

`6 Ã…`

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The correct Answer is:

Closed distance `=2r=2xx(9)/(2sqrt(2))=(9)/(sqrt(2))=(4.242)/(1.414)=3Ã…`

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