Which of the following is a metalloid?

We need to identify which of the given elements is a metalloid.

The commonly recognized metalloids are: Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te), and Polonium (Po).

Option A: Sc (Scandium) — This is a transition metal.

Option B: Pb (Lead) — This is a metal (post-transition metal in Group 14).

Option C: Bi (Bismuth) — This is a metal (post-transition metal in Group 15).

Option D: Te (Tellurium) — This is a metalloid (Group 16).

The correct answer is Option D: Te.