INTERPARTICLE FORCES 129 4. The melting points of Na and Mg at 1 atm are 98°C and 650°C, respectively. (a) Write the noble gas shorthand electron configuration for each neutral atom. (i) Na (ii) Mg (b) Identify the atomic factor(s) which could account for the large difference in melting points between the two metals. Mention both atoms in your explanations.

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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.