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Metallic Bond

In metals, th...

Question

In metals, the conduction bands are incompletely filled orbitals that allow electrons to flow.

A

true

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B

false

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C

orbit

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D

none of these

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Solution

The correct option is A true
In metals, the conduction bands are incompletely filled orbitals that allow electrons to flow. This helps in electrical conductivity. If the conduction band is completely filled, then there is no flow of electrons and the conductor becomes insulator.

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Q. Atoms with three of their outer most orbits incompletely filled with electrons are present in:

Which of the following statements are true about metals ?

(a) Valence band overlaps with conduction band

(b) The gap between valence band and conduction band is negligible

(c) The gap between valence band and conduction band connot be determined

(d) Valence band may remain partially filled

Q. Assertion :In some solids, the valence band is completely filled while the next higher band separated by an energy gap of few electrons-volts is completely empty. Reason: In insulators the energy band completely filled with electrons( the valence band) and above it is empty band (the conduction band)

Q. Assertion :If there is some gap between the conduction band and the valence band, electrons in the valence band all remain bound, and no free electrons are available in the conduction band. Reason: Some of the electrons in the valence band may gain external energy to cross trhe gap between the conduction band and the valence band.

Q. Assertion :Intrinsic semiconductors are undoped Reason: Holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band

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