Some of the metals possess a body-centered crystal structure. Which of the following statements is correct about the structure? a. There are atoms found at the center of each face of the cube. b. It has a density lower than scc. c. The corner atoms touch the center atom but not each other. d. It has a packing efficiency (74%) greater than scc and bcc.

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A:

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The Space Lattice and Unit Cells

Every matter consists of atoms, molecules, and ions. If these atoms, molecules, and ions (micro-particles) are represented in a three-dimensional space-occupying certain specific points in space, then these arrangements are termed as space lattices and the specific points which are being occupied by atoms, molecules and ions are termed as lattice points. The atoms, molecules, and ions at the lattice points are generally grouped in a regular fashion and repeat periodically at the three-dimensional space.