Calculate the number of vacancies per cubic me￾ter in gold (Au) at 900C. The energy for vacancy  formation is 0.98 eV/atom. Furthermore, the den￾sity and atomic weight for Au are 18.63 g/cm3  (at  900C) and 196.9 g/mol, respectively.

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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.