# Electronics - Voltage and Current - Discussion

### Discussion :: Voltage and Current - General Questions (Q.No.24)

24.

How many valence shell electrons are there in semiconductor atoms?

 [A]. 16 [B]. 8 [C]. 4 [D]. 2

Explanation:

No answer description available for this question.

 Nataraj.R said: (Nov 19, 2010) 3 electrons in valency shell is worst, 4 better 5 bit better 6 best

 Hari said: (Dec 31, 2010) Silicon has 4 outer most valence electrons.

 Anurag said: (Jan 8, 2011) What is semiconductor atom?

 Girish said: (Jan 8, 2011) Semiconductor are those atom which are not conductor of electricity or not insulator i.e. its electricity lies b/w of them.

 Manish Bagga said: (Jan 19, 2011) Yes it is true that semiconductor have 4 electrons in outer most shell and conductor have less than 4 electron in the outer most shell and insulater have 8 electron in outer most shell.

 Nitin said: (Jan 29, 2011) @ manish bagga.. clerify whether conductors or insulators have more valence electrons...??

 Vasu said: (Jan 31, 2011) @Girish. Please tell me more about semiconductors.

 Harsha Vardhan said: (Feb 12, 2011) Semi conductors are the devices whose conductivity lies in between the insulators and pure conductors. In general some elements from 3A (BORAN) , 4A (Si, Ge) , 5A (As, Sb) 6A (Te, Po) are the semiconductor metals having unfilled valency electrons.

 Deepika said: (May 11, 2011) @ nitin When no of valence electron in an atom is less than 4 , the material is usually a metal and a conductor. ex:sodium, magnesium, alluminium which have 1, 2 , 3 valence electron respectively. When no of valence electron in an atom is more than 4 , the material is usually a non metal and a insulator.Ex:nitrogen, sulphur, neon which have 5, 6 ,8 valence electron respectively.

 Uma Sai said: (May 16, 2011) Valence shell is the outer most shell and has least of 4 electrons for conductors.

 Asborn said: (May 20, 2011) If it has 8 valance electron it is completely filled. Since semiconductor is partially filled its valance electron is 4.

 Nidhya said: (Jun 27, 2011) More the no. of valence electrons then more the strength of bond will be. Thats why noble gases(with 8 valence e they are inert to react). We classify substances which ve 1,2,3 valance e - conductors exactly 4 valance e - semi conductors 5,6,7 valance e - insulators 8 valance e - noble gases

 Benny said: (Sep 16, 2011) Semiconductors are insulators. When we add impurities or increase the temperature, it will become conductor. Thats why it s semiconductor.

 Mayur said: (Oct 21, 2011) Hey guys, please tell me what is mean of valence electrons ?

 Avni said: (Oct 23, 2011) Valence electrons are the electrons of an atom that can participate in the formation of chemical bonds with other atoms.

 Abilash said: (Oct 29, 2011) Atomic number of silicon=14 Atomic number of Germanium=32 Electonic Structure of si=2,8,4 Electonic Structure of Ge=2,8,18,4 so valence electron of semi conductors are 4(four)

 Srinivas said: (Nov 19, 2011) Eletron structure of si= 2,8,4. Eletron structure of ge=2,8,18,4.

 Sriram Pn said: (Mar 7, 2012) Semiconductors are devices whic properties lies between conductor and insulator.

 Rakesh said: (Mar 18, 2012) Tell me about other semiconductor cases.

 Ashish Sharma said: (Apr 7, 2012) Some semiconductor may be develop by taking element of 3A & 5A like GaAs.

 Paramesh said: (Feb 15, 2013) The resistance of semiconductor lies between conductors and insulators and it is a negative temperature coefficient material i.e. when temperature increases the resistivity of the material decreases.

 Manju said: (Feb 23, 2013) 1,2,3 valance is - conductor. 4 is - semiconductor. 5,6,7 is - insulator. 8 valance is - noble gas . So valence electrons are in semiconductor is 4.

 Kunal said: (Jun 25, 2013) A semiconductor has a gap of 1 electron volt because of this valance band and conduction band can not overlap each each other. Thus flow of current is only possible when it get heated then valance band and conductor band overlap each other for example silicon and germanium which is used in making special type of semiconductor or you can say industrial devices like fet ujt zener diode triac diac devices.

 Ram said: (Feb 26, 2014) Best example is silicon, but how can we justify is is for silicon from question?

 Ramkhi said: (Feb 26, 2014) A semiconductor remains partially full valence band and partially full conduction band at the room temperature.

 Prabha said: (Jun 22, 2014) We can also say using the bonds. Conductor - Ionic bonds. Insulator - covalent bonds. Semiconductor - coordinate covalent bonds.

 Aastha said: (Oct 5, 2014) When the no.of valence electron is less than 4 then that will be a metal ion and when the no.of valence electron is more than 4 then it is a nonmetal. But if the no.of valence electron is exactly 4 then it is a semiconductor.

 Ashish said: (Feb 13, 2015) Its temperature co-efficient is -ve. While conductors are +ve co-efficient of temperature.

 Qamar Hayat said: (Mar 11, 2015) OK for valence electrons are in the semi conductor.

 Meena said: (Sep 8, 2016) I can't understand anything. So please explain me clearly.

 Logesh said: (Sep 13, 2016) The outermost orbit of the atom are valence orbit. For semiconductor 4 valence electrons are there.

 Dinesh Kumar Gadde said: (Jan 29, 2018) The outermost orbit of an atom is called as valence shell. The number of valence electrons present in a valence shell is based on its capacity. For example: take silicon a semiconductor, which has 4 valance electrons.