The number of valence electrons in silicon atom is 4 2 1 zero

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Question
The number of valence electrons in silicon atom is
Options
A. 4
B. 2
C. 1
D. zero

Correct Answer

4

Materials and Components problems

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2. Assertion (A): Ionic solids, in general, have no electrical conductivity.
Reason (R): In ionic solids, electrons are tightly bound to the nucleus.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

4. An electron in a metal suffers collision and if the probability of it being scattered over an angle d? is 2p P(?) sin ? d? where P(?) is an arbitrary function of scattering angle ?, then
Options
A. 2pP(?) sin ? d? = 0
B. 2pP(?) sin ? d? = 2
C. 2pP(?) sin ? d? = -1
D. 2pP(?) sin ? d? = 1

6. When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
Options
A. becomes a paramagnetic material
B. becomes a very strong ferromagnetic material
C. becomes diamagnetic material
D. none of the above

7. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is
Options
A. T
B. 2T
C. 4T
D.

9. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are
Options
A. 2
B. 3
C. 4
D. 5

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