chemistry

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Calculate the density of atoms in (001) in lithium. Express answer in atoms/cm.

• chemistry -

Lithium is a BCC Crystal
a = 3.5092 * 10^-8

Planar Density (001) (top plane) = 1/a^2

= 8.12 * 10^14

• chemistry -

wrong

• chemistry -

What is the correct answer flou??

• chemistry -

I try again

• chemistry -

If lithium is a BCC crystal.

planar density is atoms per area
the 001 plane look like this
o--o
| |
o--o

the sides are equal to lattice constant a
and the atoms in this area = 4(1/4) = 1

• chemistry -

I tried but its graded wrong 4 times. that's correct it is BCC. atom of this area is ! only but still tere is a mistake

• chemistry -

Am i the only one to make the obvious question here? If we knew how we got the answer, we could spot a mistake that might have been overlooked this entire time. How did we get the answer?

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The question has a mistake in it, look at the forum...

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1.218*10^15

(001) its "Body" plane !!!!
0---0
|.0.|
0---0

4*(1/4)+ 1(1/2)= 1.5
1.5/a^2= 1.218*10^15

• chemistry -

1.16e15