Aluminium (Al) has a face-centered cubic structure, with lattice parameter a = 4.05 × 10−10 m. If each Al atom loses three electrons to make a free electron gas in the metal, what is the electron density ne?

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Q: O-CH3 CH3-CH-CH3

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Q: please explain and answer

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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.