Question #307256

** Question 1**

Compute the net potential energy of a simple Na+Cl- pair. The equilibrium distance between the ions is 0.28nm. The potential energy due to repulsion between electron sis given by Ur = β/r8(10)

**Question 2**

*2.1 α-Co *has an *hcp *structure with lattice spacings of *a= *2.51 A0 and c = 4.07 A0, β *Co *is *fcc, *with a cubic lattice spacing of 3.55 A0. What is the difference in density between the two forms?(5)

2.2 Sodium transform from bcc to hcp at about T = 23K. Assuming that the density remains fixed, and the c/ *a *ratio isideal, calculate the *hcp *lattice spacing *a *given that the cubiclattice spacing *a' *= 4.23 A0 in the cubic phase. (5)

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