Answer to Question #175542 in Mechanical Engineering for John

Question

The dielectric constant of Si is 11.9. What is the electronic polarisability due to the 

valence electrons per Si atom?

Answer 1

α=αc+α∞+α0.

A silicon atom has fourteen electrons. ...

Of these, four are valence electrons, occupying the 3s orbital and two of the 3p orbitals.

Electrons per shell: 2, 8, 4

Electron configuration: 3s² 3p²

Hence valence electrons per Si atom = 4