Final answer:
Out of the options, only astatine is not a metalloid; it is a halogen. The metalloids listed are boron, silicon, arsenic, and tellurium. These elements exhibit semiconductor properties.
Step-by-step explanation:
The question pertains to identifying which of the given elements is not a metalloid. The metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. These elements have properties that are intermediate between those of metals and nonmetals, making them semiconductors. Given the options, the element which is not a metalloid is astatine (E). Astatine is a halogen, not a metalloid, and it is positioned in the halogen group of the periodic table. So, the correct answer is E) Astatine.