Magnesium oxide (MgO) is a ionic compound. Explain what is the main parameter affecting the crystal structure in binary (i.e. formed by only two chemical elements) ionic compounds. Crystal structure of MgO is the rock-salt crystal structure; draw the structure of MgO and calculate its theoretical density. Data of ionic radii and atomic weight are reported hereafter. Finally, illustrate a possible intrinsic point defect in this ionic compound.
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Characteristics of Selected Elements Atomic Density of Crystal Atomic Ionic Most Melting Atomic Weight Solid, 20'C Structure, Radius Radius Common Point Element Symbol Number (amu) (g/cm) 20 C (nm) (nm) Valence LIInIum LI 0.94 U.J34 BLU U.IJZ U.UDS I+ Magnesium Mg 24.31 1.74 HCP 0.160 0.072 2+ 649 Manganese Mn 25 54.94 7.44 Cubic 0.112 0.067 2+ 1244 Mercury Hg 08 200.59 0.110 2+ -38.8 Molybdenum Mo 42 95.94 10.22 BCC 0.136 0.070 4+ 2617 Neon Ne 10 20.18 Inert -248.7 Nickel Ni 28 58.69 8.90 FCC 0.125 0.069 2+ 1455 Niobium Nb 41 92.91 8.57 BCC 0.143 0.069 5+ 2468 Nitrogen 7 14.007 - 0.01-0.02 5+ -209.9 Oxygen 8 16.00 0.140 2- -218.4 Phosphorus 15 30.97 1.82 Ortho. 0.109 0.035 5+ 44.1 Platinum 78 195.08 21.45 FCC 0.139 0.080 2+ 1772 A ARI A LAR
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