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04: Find the cohesive energy per atom per Nacl crystal from the following data:
Equilibrium separation between ions, R. = 2.81 Á, Madelung constant,
1.748, lonization energy of Na
Electron affinity of Cl
+ 5.1 eV,
3.6 eV, Repulsive component, n=9.
a =

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QUESTION 10 The lattice energy of CsCl is 633 kJ/mol, the Madelung constant, a, is 1.763, and the Born exponent, n, is 10.7. The ionic radius of Cl- is known to be 1.81 A, e = 1.6 X 10-19 C and NA = 6.02 X 1023 atom/mol. The estimate ionic radius of Cst is: A. 1.69 Å B. 1.81 A C. 3.5 nm D. 3.5 Å
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28 2. Calculate the Fermi energy for the valence electrons in sodium metal given that the valency of sodium is one, the density of sodium is 0.97 g cm-3, the mass of the electron is 9.05 × 10-²8 g, Planck's constant is 6.62 x 10-27 erg sec, Avogadro's number is 6-025 × 10²³ per gramme molecule and the atomic weight of sodium metal is 23. (Ans: €(0) = 3-12 eV, T≈ 37,000°K.) 73
Hello, Can I please have help regarding this problem ? Thanks. Suppose that the clock on our lecture room has a minute-hand length of 10 cm.(Use a coordinate system with the origin at center of clock and +x axis along the3PM direction and the +y direction along the 12PM direction). From the 12 to 8mark, for the tip of the minute hand:a) Sketch a vector diagram labeling ri, rf, Δr, Vi, Vf, and ΔV.b) Calculate the displacement vector in unit-vector notation.c) Calculate the average velocity vector in unit-vector notation.d) Calculate the average acceleration vector in unit-vector notation.e) Calculate magnitude and direction of the average acceleration vector.f) Calculate the magnitude and direction of the total acceleration of the tip ofthe minute hand at the 6 mark.