Question

A unit of a crystal is sharing two nearby unit cells, where will the unit be located? Answer for 2 marks​

Answer 1

Answer:

A cubic unit cell has six faces. Therefore, in a cubic lattice irrespective of its nature, a cubic unit cell is shared equally by 6 unit cells.

Explanation:

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Answer 2

Explanation:

The constituent particles in case of ionic crystals are ions.These ions are arranged in a definite regular and repeating pattern to form an ionic crystal.For ex- NaCl there is repeating Na+ and Cl-- ions.When there is regular arrangement of such ions in three-dimensional space ,they generate a crystal lattice.If we look carefully such crystal lattice we will find that there is a regular repeating pattern through out the crystal .Such smallest repeating portion in three-dimensional space which when repeated over and again in different directions produces the entire crystal lattice is called a unit cell.The arrangement of constituent ions on the corners,edges,and faces of a unit cell when observed indicates that they are shared by more than one unit cell.For ex- an atom on a face is shared by two unit cells,so only half of the atom belongs to each of these cells.On the other hand an atom on an edge is shared by four unit cells,and an atom on a corner is shared by eight unit cells.Thus,only one-quarter of an atom on an edge and one-eighth of an atom on a corner can be assigned to each of the unit cells that share these atoms,which suggest that a unit cell of an ionic crystal shares some of its ions with