A sample of an alkali metal that has a b.c.c. unit cell is found to have a mass of 1.000 g and a volume of 1.0298 cm3 (note that this is NOT the volume of the unit cell). The metal is allowed to react with excess water, producing 539.29 mL of hydrogen gas at 0.980 atm and 23 ̊C. a. Identify the metal and write the balanced equation for the reaction with water. b. Determine the unit cell dimensions. c. Give the approximate size of the atom in pm.

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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.