Energy of Interaction of Point Charges Coulomb's Law yields an expression for the energy of interaction for a pair of point charges. V = V is the energy (in J) required to bring the two charges from infinite distance separation to distance r (in nm). 21 and Q2 are the charges in terms of electrons. (i.e. the constant in the above expression is 2.31x10-19 J nm electrons 2) d 2.31 x 10-1⁹Q1 Q2 For a group of "point" charges (e.g. ions) the total energy of interaction is the sum of the interaction energies for the individual pairs. Calculate the energy of interaction for the square arrangement of ions shown in the diagram below. (+2) Pº d = 0.900 nm. -2 d +2

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5. Rationalize the difference in the atomic and ionic radii of the following species: a) Se (117 pm) and Se²- (198 pm) b) K (231 pm) and K+ (133 pm)

Item 5 Answer the following questions related to the chemical bonding in substances containing Cl. (a) What type of chemical bond is present in the Cl2 molecule? (b) Cl2 reacts with the element Sr to form an ionic compound. Based on periodic properties, identify a molecule, X2, that is likely to react with Sr in a way similar to how Cl2 reacts with Sr. Justify your choice.   (c) A graph of potential energy versus internuclear distance for two Cl atoms is given below. On the same graph, carefully sketch a curve that corresponds to potential energy versus internuclear distance for two Br atoms. (d) In the box below, draw a complete Lewis electron-dot diagram for the C2Cl4 molecule.   (e) Answer the following based on the diagram you drew above. (i) What is the hybridization of the CC atoms in C2Cl4?   (ii) What is the approximate chlorine-carbon-chlorine bond angle in C2Cl4? (iii) Is the C2Cl4 molecule…