Question A2 The body-centred cubic structure is common among metals. a) How many nearest neighbours has each atom in this structure? Give the nearest-neighbour distance in terms of the unit cell parameter a. b) How many second-nearest neighbours has each atom in this structure? Give the second- nearest-neighbour distance in terms of the unit cell parameter a. c) How many third-nearest neighbours has each atom in this structure? Give the third-nearest- neighbour distance in terms of the unit cell parameter a.

Quantum Mechanics, physical chemistry. Screenschot of question attached. For this question, assume the atoms have average atomic masses. Actual molecules will have different isotopes so variation in energy levels will result from different isotopes.

p9C.1 Familiarity with the magnitudes of overlap integrals is useful when con- sidering bonding abilities of atoms, and hydrogenic orbitals give an indication of their values. (a) The overlap integral between two hydrogenic 2s orbitals is 1 ( ZR ZR +. 2а, " 12 а, 1 + ZR 240 a, -ZR/Z0 S(2s, 2s)={1+ Plot this expression. (b) For what internuclear distance is S(2s,2s) = 0.50? (c) The side-by-side overlap of two 2p orbitals of atoms of atomic number Z is ZR 1 ( ZR ZR S(2p,2p) ={1+ 10 a, 2a, 120 a. Plot this expression. (d) Evaluate S(2s,2p) at the internuclear distance you calculated in part (b).

The plot below shows bonding energy vs. interatomic separation for two elements. АВ %3D A. Which element would you expect to have a lower melting point? A same can't tell provide a brief justification of your choice. B. Which element would you expect to have a smaller lattice constant? A B same can't tell provide a brief justification of your choice. C. Which element would you expect to have a larger elastic modulus? A B same can't tell provide a brief justification of your choice. D. Which element would you expect to have the highest yield stress? A B same can't tell provide a brief justification of your choice. Bonding energy

Q2 part c

M Inbox (44,3 x w Virginia Cor X Frcc Chapter 4 H x Visual session.masteringphysics.com/myct/itemView?assig Apps Getting Started Thomson Reuters o ADP ezLaborManag Ch 07 HW Exercise 7.35 - Enhanced - with Feedback The potential energy of two atoms in a diatomic molecule is approximated by U (r) = a/r-b/r°, where r is the spacing between atoms and a and b are positive constants.