Materials with partially filled bands are metallic conductors, and materials with only completely filled bands are electrical insulators. Y Part A Explain why the population of the bands affects the conductivity An electrical potential cannot shift electrons from one set of energy levels to the other if the band is partially filled and hence electrons can move witwin the band. If the band is completely filled, electrons cannot move within the band If the band is completely filled, there are no available vacant energy levels to which electrons can be excited. If the band is completely filled, too many electrons can be excited.

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Materials with partially filled bands are metallic
conductors, and materials with only completely
filled bands are electrical insulators.
Y Part A
Explain why the population of the bands affects the conductivity
An electrical potential cannot shift electrons from one set of energy levels to the other if the band is partially
filled and hence electrons can move witwin the band.
If the band is completely filled, electrons cannot move within the band
If the band is completely filled, there are no available vacant energy levels to which electrons can be excited.
If the band is completely filled, too many electrons can be excited
Transcribed Image Text:Materials with partially filled bands are metallic conductors, and materials with only completely filled bands are electrical insulators. Y Part A Explain why the population of the bands affects the conductivity An electrical potential cannot shift electrons from one set of energy levels to the other if the band is partially filled and hence electrons can move witwin the band. If the band is completely filled, electrons cannot move within the band If the band is completely filled, there are no available vacant energy levels to which electrons can be excited. If the band is completely filled, too many electrons can be excited
Cesium metal is very soft, and tungsten metal is very hard. Explain the difference using the electron-sea model.
The nucleus of W has a greater positive charge than that of Cs, thus the valence electrons are less strongly held.
The nucleus of W has a greater positive charge than that of Cs, thus the valence electrons are more strongly held.
W has more electrons in anti-bonding bands when compared to Cs.
W has less valence electrons when compared to Cs.
W has less electrons in anti-bonding bands when compared to Cs.
W has more valence electrons when compared to Cs.
Transcribed Image Text:Cesium metal is very soft, and tungsten metal is very hard. Explain the difference using the electron-sea model. The nucleus of W has a greater positive charge than that of Cs, thus the valence electrons are less strongly held. The nucleus of W has a greater positive charge than that of Cs, thus the valence electrons are more strongly held. W has more electrons in anti-bonding bands when compared to Cs. W has less valence electrons when compared to Cs. W has less electrons in anti-bonding bands when compared to Cs. W has more valence electrons when compared to Cs.
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