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Cubic Array
CN=4, PE= 68%, aaaa pattern
Hexagonal Array
CN= 6 PE= 74%
Simple Cubic Unit Cell (SC)
CN= 6, PE= 52%, l=2r, 1 atom/unit cell, pollonium is only metal with SC
Body Center Cubic Arrangement (BCC)
CN=8, PE= 68%, l= 4/srqt(3) * r, 2 atoms/unit cell, common
Cubic Close Packed (CCP) or Face Centered Cubic (FCC)
CN=12, PE=74%, l=srqt(8)*r, 4 atoms/unit cell, abcabc pattern, common
hexagonal close-packed arrangment (HCP)
CN=12, PE= 74%, 2 atoms/unit cell, abab pattern, common
