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What is the Coordination number of FCC (CN):
If we take the corner atom, the face centered atoms are the nearest neighbors. A corner atom has four face centered in its own plane, four in a plane above and four in a plane below it. As, the coordination number is 12. Because of its highest CN, this is a closed packed structure.
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The hydride ions H- are isoelectronic with: (1) Li (2) He + (3) He (4) Be Ans: He
Li(s)+n2(G)
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