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...Structure of metals on the basis arrangement constituent particles solids are classified as crystalline atoms or molecules arranged in regular repetition pattern dimensions eg non amorphous not glass rubber plastics and aammororpphhoouuss space lattice dimensional network imaginary lines connecting a crystal unit cell smallest portion which when repeated all direction give rise to it is building block body centered cubic bcc one atom at each corners centre cube room temperature iron exhibit other possessing this v mo cr ba etc...