# ss_2 - 3 Aluminum has the FCC crystal structure Its atomic...

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Unformatted text preview: 3. Aluminum has the FCC crystal structure. Its atomic weight is 26.98 g/mole, and its density is 2.70 g/cms. Determine the atomic radius of a single aluminum atom. Iv Loon ‘i W 2;: ma" / K EV»? WW; Va“; @091 War: —_ 33* —, 7.10 %\= 7) 1% “2,013 mm?) =\) Q, : 1w \m} \ .. 0:00 Q1036; Th 9,: 5).me m was RMS mm "‘" Wmm er‘éS 4. Aluminum and silver have similar lattice parameters and crystal structures. From these, determine the density of each metal and explain why the two densities are so different despite the fact that the atomic sizes are so similar. bassmz W M W {X swum Nva M Na {Xxxﬁaxmuh RUM IRE EON \$¥W§ moms RUWJST‘ We EN-h eases k sxmsa {\Tor— \w-a W W291 mamm‘sfwm" woe/Wash “Q WT <§ Nag/t each vauch . ewes oh? (9M . |—___—____———l 13. On a cube draw: a) [001}; [00?]; [111]; [211] b) (001); (100); (111); (2h) T {DOW-X f—'__—____—_—| 16. Calculate the area packing fraction (area of atomsfarea of plane) for the (111) plane in FCC. Compare this to the APF for the (100) plane in FCC. ]—'__—'__—___—_l 24. The Atomic Packing Fraction, APP, characterizing a particular crystal structure refers to the volume fraction of a unit cell which is occupied by atoms. The remaining volume is vacuum. Show that the APP for an FCC unit cell is 0.?4. 25. In an FCC unit cell and list the position coordinates of the atoms whose centers are intersected by the direction vectors: [101] and [111]. ...
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ss_2 - 3 Aluminum has the FCC crystal structure Its atomic...

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