Select the correct order for covalent radii :
Select the correct order for covalent radii :
The correct option is B Octahedral radii > tetrahedral radii > linear radii
1. If the triangular void in a close-packed layer has a sphere directly over it, there results a void with four spheres around it, as shown Such a void is called a tetrahedral void since the four spheres surrounding it are arranged on the corners of a regular tetrahedron.
If R denotes the radius of the four spheres surrounding a tetrahedral void, the radius of the spheres that would just fit into this void is 0.225 R.
(ii) If a triangular void pointing up in one close-packed layer is covered by a triangular void pointing down in the adjacent layer, then a void surrounded by six spheres results . Such a void is called an octahedral void since the six spheres surrounding it lie at the corners of a regular octahedron.
The radius of the sphere that would just fit into an octahedral void in a close-packing is 0.414 R.
Ocathedral radii > tetrahedral radii > linear radii
1. If the triangular void in a close-packed layer has a sphere directly over it, there results a void with four spheres around it, as shown Such a void is called a tetrahedral void since the four spheres surrounding it are arranged on the corners of a regular tetrahedron.
If R denotes the radius of the four spheres surrounding a tetrahedral void, the radius of the spheres that would just fit into this void is 0.225 R.
(ii) If a triangular void pointing up in one close-packed layer is covered by a triangular void pointing down in the adjacent layer, then a void surrounded by six spheres results . Such a void is called an octahedral void since the six spheres surrounding it lie at the corners of a regular octahedron.
The radius of the sphere that would just fit into an octahedral void in a close-packing is 0.414 R.
Ocathedral radii > tetrahedral radii > linear radii
