How does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors?

Metalloids generally have three to six valence electrons. This places them between metals, which tend to lose electrons, and nonmetals, which tend to gain electrons. Their electrons can move under certain conditions, but not as freely as in metals, which is why metalloids can act as semiconductors. Choice D identifies their valence-electron range and ability to lose or gain electrons.

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