The number of atoms per unit cell and the number of slip

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The number of atoms per unit cell and the number of slip systems, respectively, for a facecentered cubic (FCC) crystal are

1. 3, 3
2. 3, 12
3. 4, 12
4. 4 ,48

Correct Option: C

No of atoms per unit cell in FCC ⇒

=	1	× 8 (each corner) +	1	× 6 (each face) = 1 + 3 = 4
	8		2

No. of slip systems in FCC are 12.