trontium oxide has a face-centered cubic unit cell of oxide ions with the strontium in octahedral holes. If the radius of Sr2+ is 127 pm and the density of SrO is 4.7 g/cm3, what is the radius of the oxide ion? (100 cm = 1 × 1012 pm) 176 pm 132 pm 127 pm 137 pm 273 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.