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Calculate the number of particles (atoms...

Calculate the number of particles (atoms) per unit cell in a FCC crystal lattice.

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Number of particles
`"per unit cell of FCC"="8 atoms at corner "xx(1)/(8)"(Contribution)"+"6 atom at each face"xx(1)/(2)"(contribution)"`
`=8xx(1)/(8)+6xx(1)/(2)=1+3="4 atoms or particles"`
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