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Zorluk: OrtaConductors, Insulators, and Semiconductors

Pure elemental silicon and germanium serve as the foundation of modern solid-state electronics due to their intermediate electrical conductivity. What atomic characteristic distinguishes these Group IV elements as semiconductors?

  1. A
    They contain only one weakly held outer electron that drifts freely between atomic nuclei.
  2. They have exactly four valence electrons in their outermost shell, creating a stable covalent lattice under normal conditions.Cevap
  3. C
    They feature a full valence shell of eight electrons that completely blocks electrical charge movement.
  4. D
    They maintain a permanent net positive charge that actively opposes the flow of conventional current.

Cevap

Pure silicon and germanium are classified as semiconductors because their atoms possess four valence electrons in their outermost shell, forming covalent bonds that yield intermediate electrical conductivity.
Semiconductors such as silicon (SiSi) and germanium (GeGe) belong to Group IV of the periodic table and have four valence electrons in their outer shell. In crystalline form, each atom shares these four electrons with adjacent atoms via covalent bonds, resulting in electrical conductivity that lies midway between conductors (which typically have 11 to 33 loosely held valence electrons) and insulators (which typically have 55 to 88 tightly held valence electrons).

Adım Adım Çözüm

1
Determine the valence electron configuration of Group IV elements like silicon and germanium.
Both silicon (SiSi) and germanium (GeGe) possess exactly 44 valence electrons in their outer energy shell.
The number of outer-shell valence electrons dictates how easily charge carriers can be released for electrical conduction.
2
Compare the valence count of semiconductors with conductors and insulators.
Conductors generally have 11 to 33 valence electrons, semiconductors have exactly 44, and insulators typically have 55 to 88 tightly bound valence electrons.
With 44 valence electrons, neighboring atoms share electrons in covalent bonds, making pure semiconductors moderate conductors at room temperature.

Anahtar Kavram

Semiconductor atomic structure and valence electrons
Tahmini Süre:1m 0s
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Conductors, Insulators, and Semiconductors

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