Summary of the 4

	sc	bcc	fcc	hcp
Unit cell
Constants	$a$	$a$	$a$	$a, c$ (where $c > a$)
With atom radius	$a=2r$	$a=\frac{4}{\sqrt{3}}r$	$a=\frac{4}{\sqrt{2}}r$	$a = 2r ; c=\sqrt{\frac{8}{3}}a$
Volume	$a^3$	$a^3$	$a^3$	$\frac{3}{2} \sqrt{3} a^2c$
Atoms per unit cell	1	2	4	6
Composition	$8\cdot\frac{1}{8}$	$8\cdot\frac{1}{8}+1$	$8\cdot\frac{1}{8}+6\cdot\frac{1}{2}$	$3+12\cdot\frac{1}{6}+2\cdot\frac{1}{2}$
Near-neigbour distance	$a$	$\frac{\sqrt{3}a}{2}$	$\frac{a}{\sqrt{2}}$	$a$
Coordination number	6	8	12	12
APF	52.36%	68%	74%	74%
Examples	Po	Fe, Cr, W	Al, Cu, Ni	Mg, Zn

Sources of the images:

• Simple cubic: Original file @ Wikipedia
• Body-centered cubic: Original file @ Wikipedia
• Face-centered cubic: Original file @ Wikipedia
• Hexagonal close-packed: By Original: Dornelf Vector: DePiep - Own work based on: Hexagonal close packed.png, CC BY-SA 3.0, Link