Electronic Devices - Semiconductors - Discussion
Discussion Forum : Semiconductors - General Questions (Q.No. 12)
12.
Effectively, how many valence electrons are there in each atom within a silicon crystal?
Discussion:
32 comments Page 3 of 4.
DURYODHAN said:
1 decade ago
The question asked is for crystal but not for an atom. So, Si crystal has 8 valence electrons I agree with 8.As we all know that a single si atom has 4 valence electrons in valence orbit. the covalent bonding is done between 4 same si atom by sharing one electron from one atom.
4 valence electrons + 4 shared(1+1+1+1)=8 electrons
4 valence electrons + 4 shared(1+1+1+1)=8 electrons
Mani said:
1 decade ago
As we all know that a single si atom has 4 valence electrons in valence orbit. the covalent bonding is done between 4 same si atom by sharing one electron from one atom.
4 valence electrons + 4 shared(1+1+1+1)=8 electrons
4 valence electrons + 4 shared(1+1+1+1)=8 electrons
Ashraf said:
1 decade ago
The question asked is for crystal but not for an atom. So, Si crystal has 8 valence electrons I agree with 8.
Rajalingam said:
1 decade ago
But the question asked is for an atom. Its not mentioned about the neighbouring atoms!
Mohana raga deepthi said:
1 decade ago
I too agree with Hariom explanation.
Rajkumaran said:
1 decade ago
Yes what hari om said is right.
Hariom said:
1 decade ago
@prithvi
Si have 4 electron in it's outer most orbit and these 4 electrones will form covalent bond with the 4 neighbouring Si atom thus each Si atom in the crystal will now have 8 elctrones.
Si have 4 electron in it's outer most orbit and these 4 electrones will form covalent bond with the 4 neighbouring Si atom thus each Si atom in the crystal will now have 8 elctrones.
Prithvi said:
1 decade ago
@prasanna please explain more clearly
PRASANNA said:
1 decade ago
It has mentioned si crystal, so 4 valance+4 shared=8.
Raj singhania said:
1 decade ago
The answer is 4 why because the atomic no of Si is 14 and the orbital states will be 2, 8, 4. So the valence electron must be 4 and not 8.
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