SOLUTION

The strength of a semiconductor crystal comes from Electrons-Pairs bonds.

• Each atom that is normally bonded with the nearest neighbor atoms results in a special shape called a crystal.
• A silicon atom that is a part of a crystal has eight electrons in the valence orbit and four neighbor atoms.
• Each of the four neighbors shares one electron. Since each shared electron is being pulled in opposite directions, it is a kind of a bond between the opposite cores.
• This type of bond is known as a covalent bond. The covalent bonds hold the tetravalent crystal together, ensuring its stability.