Related Questions

Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
A semiconductor has generally ___________ valence electrons.
A 2
B 3
C 6
D 4
A pentavalent impurity has ___________ Valence electrons
A 3
B 5
C 4
D 6
A trivalent impurity has valence electrons
A 4
B 5
C 6
D 3
How may valence electrons does a silicon atom have?
A 0
B 1
C 2
D 4
E None of the above
In a metal, the valence electrons
A Are not shared
B Are shared only between neighbouring atoms
C Are shared by all atoms
D Either B or C
Rahim has invited his three buddies over to watch the basketball game on his wide-screen television. They are all hungry, but no one wants to leave to get food. Just as they are arguing about who should make the food run, a commercial comes on for a local pizzeria that delivers. The phone number flashes on the screen briefly and they all try to remember it. By the time Zachary grabs a pen and paper, each of them recollects a different number.i. All of the men agree that the first three numbers are 995.ii. Three of them agree that the fourth number is 9.iii. Three agree that the fifth number is 2.iv. Three agree that the sixth number is 6; three others agree that the seventh number is also 6.Which of the numbers is most likely the telephone number of the pizzeria?
A 995-9266
B 995-9336
C 995-9268
D 995-8266
If A has 4 elements and B has 8 elements then the minimum and maximum number of elements in A∪B are respectively __
A 4,8
B 8,12
C 4,12
D 6,12
A free electron is a valence electron that has broken away from its parent atom.
A True
B False
Which of the following elements has a total of 3 shells with 8 electrons in the last orbit?
A Ar
B P
C S
D Al

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