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MHT CET202611 April 2026Morning ShiftChemistrySolid StateActual

What is the total number of spheres that surrounds the tetrahedral hole in the close-packed three-dimensional structure?

Options

  1. A2
  2. B4
  3. C6
  4. D8

Correct answer

B. 4

Step-by-step solution

A tetrahedral void is formed when a sphere of the second layer is placed exactly over the triangular void formed by three spheres of the first layer. Thus, a tetrahedral hole is surrounded by 4 spheres ( 3 in one layer and 1 in the adjacent layer). The coordination number of a tetrahedral void is 4 . Answer: 4

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