Question

how does the number of valence electrons in atoms of metalloids explain why metalloids are semiconductors?
they have one or two valence electrons, so they cannot lose electrons easily.
they have one or two valence electrons, so they can lose or gain electrons.
they have three to six valence electrons, so they cannot lose electrons easily.
they have three to six valence electrons, so they can lose or gain electrons.

Explanation:

To determine the correct answer, we analyze metalloids' valence electrons and semiconductor behavior:

1. Recall metalloids' valence electrons: Metalloids typically have 3–6 valence electrons (not 1–2, which is more characteristic of metals).
2. Analyze electron behavior: Metals (1–2 valence electrons) lose electrons easily; non - metals (5–7 valence electrons) gain electrons easily. Metalloids, with 3–6 valence electrons, can either lose or gain electrons (unlike the incorrect options that say they "cannot lose electrons easily" or use the wrong valence electron range).
3. Match with semiconductor property: The ability to lose or gain electrons (or share in covalent bonds) allows metalloids to act as semiconductors (conducting under certain conditions). So the option "They have three to six valence electrons, so they can lose or gain electrons" is correct.

Answer:

D. They have three to six valence electrons, so they can lose or gain electrons. (assuming the options are labeled A, B, C, D in order as presented)