What are the tetrahydral hole and octahydral hole ? How they are formed explain ? 

A hole is

In a compound oxide ions have CCP arrange ment. Cations A are present in one-eighth of the tetrahedral holes and cations B occupy half of the octahedral holes. The simplest formaula of the compound is

What relation holds good between the numbers of octahedral and tetrahedral holes in a lattice formed by spheres ?

What are the microscopic holes in a leaf called?

Following is the fact about the newly discovered superconductor of C_(60) (fullerene). The alkali metal fulleride superconductor M_(3)C_(60) has a cubic closest-packed (face-centered cubic) arragement of nearly spherical C_(60)^(3-) anions with M^(+) cations in the holes between the larger C_(60)^(3-) ions. The holes are of two types-octahedral holes, which are surrounded octahedrally by six C_(60)^(3-) ions, and tetrahedral holes, which are surrounded tetrahedrally by four C_(60)^(3-) ions. How many C_(60)^(3-) ions, octahedral holes, and tetrahedral holes are present per unit cell

The tiny holes on the surface of leaf are called.

Big holes in Swiss cheese are made by