The number of atoms per unit cell of the...

The number of atoms per unit cell of the two dimensional square unit cell shown below is:

A

`2`

B

`1`

C

`4`

D

`8`

Verified by Experts

The correct Answer is:

D

Packing efficiency
`=("Area covered by particle")/("Total area")`
`=(2pir^(2))/((2sqrt(2)r)^(2))=pi/4`
`=(3.142)/4xx100=78.55%`

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