MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistrySolid stateCu Ag Au

Potassium has a bcc structure with nearest neighbour distance 4.52 Å. Its atomic weight is 39. Its density will be

A.454 kg m

B.804 kg m

C.852 kg m

D.908 kgm✓ Correct

Explanation

In bcc. Nearest neighbour distance As, ° 3 4.52A 2 a So, 8 5.23 10 a x cm Solid state 8 In BCC, ° 3 2.26A 4 a r Density 3 3 3 23 8 3 3 3 3 2 39 0.91 / 6.02 10 5.23 10 0.91 100 / 1000 910 / 908 kg/m x x x x x x x A z m Z g cm N a kg m kg m

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