Silicon has 14 electrons total.Level 1 with 2 electrons, level 2 with 8 more electrons, and 4 electrons left for level 3.

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∴ Silicon has 4 valence electrons.



Important Points

The material which is not a good conductor or a good insulator is called the semiconductor.

Example: Silicon, Germanium, etc.

Types of semiconductor:

Intrinsic semiconductors: It is an undoped semiconductor or pure semiconductor without adding any impurity

Non-intrinsic or extrinsic semiconductor: It is a semiconductor that is doped with a specific impurity that can modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.)

Note: Depending upon the impurity added nonintrinsic semiconductors can be classified into P-type and N-type semiconductors depending on whether the semiconductor is rich in holes or electrons.

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