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- Given that the atomic radius of Mo (110) is 0.146 nm. Calculate it's planar density and express the answer in atoms per nm^2With the exception of helium, the noble gases condense toform solids when they are cooled sufficiently. At temperaturesbelow 83 K, argon forms a close-packed solid whosestructure is shown below. (a) What is the apparent radius ofan argon atom in solid argon, assuming the atoms touch asshown in this figure? (b) Is this value larger or smaller thanthe bonding atomic radius estimated for argon in Figure 7.7?(c) Based on this comparison would you say that the atomsare held together by chemical bonds in solid argon?The experimentally determinded Bi-Cl bond distance in bismuth trichloride is 2.48Å . Given the tablulated value of 0.99Å for the atomic radius of Cl, predict the atomic radius of Bi?
- Consider the Mg2+, Cl-, K+, and Se2- ions. The four spheresbelow represent these four ions, scaled according to ionic size.(a) Without referring to Figure 7.8, match each ion to its appropriatesphere. (b) In terms of size, between which of the sphereswould you find the (i) Ca2+ and (ii) S2- ions?The experimental Bi¬I bond length in bismuth triiodide,BiI3, is 2.81 Å. Based on this value and data in Figure 7.7, predictthe atomic radius of Bi.In group 15 elements, there is considerable increase in covalent radius from N to P but small increase from As to Bi. Give reason.
- Tungsten has the highest melting point of any metal in theperiodic table: 3422 °C. The distance between W atoms intungsten metal is 2.74 Å. (a) What is the atomic radius of atungsten atom in this environment? (This radius is calledthe metallic radius.) (b) If you put tungsten metal underhigh pressure, predict what would happen to the distancebetween W atoms.what are likely possibilies for X if Xn + Cl -> XCl2 can you help explain how to solve this? Would it be any element in the 2nd s2 row (Be, Mg, Ca, Sr, Ba, Ra)?6. Calculate the planar density of a BCC element if the radius is 0.125 nm. 7. Calculate the linear density of Al in [210], if its radius is 0.405 nm.