The internuclear distance between two closest Kr atoms in solid krypton is about 4.0 Å. The polarizability of krypton is 2.54 x 10-30 m3, and the first ionization energy is 1351 kJ-mol-1. Estimate the boiling point of krypton. [Hint: Calculate the potential energy due to dispersion interaction for solid krypton, and equate this quantity to the average kinetic energy of 1 mole of krypton gas, which is (3/2)RT.] K Supporting Materials I Periodic Table I Constants and I Supplemental Data Factors

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.