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JEE Main
Exam
JEE Main
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main · Chemistry · p Block Elements (Group 13 & 14)

The building units of various crystalline forms of boron are:

The building units of various crystalline forms of boron are:The building units of various crystalline forms of boron are:

Options

  1. AB12{B}_{12} icosahedral units
  2. BB4{B}_{4} tetrahedral units
  3. CB6{B}_{6} octahedral units
  4. DB8{B}_{8} cubical units

Correct answer

A. B12{B}_{12} icosahedral units

Step-by-step solution

Crystalline boron consists of B12{B}_{12} icosahedral units having 1212 corners and twenty faces. Each corner is represented by a thickened circle as shown in the figure.

The building units of various crystalline forms of boron are:

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