Which of the following elements is a metalloid?

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Accepted Answer

1. Map the choices:
   - a) Iron (Fe)
   - b) Oxygen (O2)
   - c) Sodium (Na)
   - d) Silicon (Si)

2. Definition: A metalloid has intermediate properties between metals and nonmetals (often semiconducting behavior).

3. Classification:
   - Iron: a transition metal, good conductor — a metal.
   - Oxygen: a diatomic nonmetal gas.
   - Sodium: an alkali metal, very metallic.
   - Silicon: a brittle solid with intermediate electrical conductivity (widely used as a semiconductor); chemical symbol $Si$, atomic number $14$ — a metalloid.

Conclusion: the metalloid among the options is Silicon (d).

FINAL_ANSWER: d

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