I would like to know why point defect will not influence density .Please answer me with close reference to a proper diagram.My intuition is because of a localized affair but would be happy if anyone would highlught on the same.
Who told you that point defects do not affect the materials density? As far as I remember, you can even measure the amount of point defects (vacancies) by monitoring the density....
Density is definitely sensitive to the atomic structure of any material. A very simple example is to consider phase or allotropic transformations in materials. For example, carbon in the form of diamond and graphite have different densities.
The bottom line is, the packing efficiency of a particular structure determines the density.
Regarding your query about point defects, it is quite subjective. If the number of point defects is a significant fraction of lattice points, density will start getting affected. It is analogically similar to consider a material with a few casting pores and then comparing it with a metallic foam. The former will have the same density as the fully dense material, while the latter will not.
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