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Which of the following elements is a metalloid?

Chemistry
WAEC 2025

Which of the following elements is a metalloid?

  • A. Aluminium
  • B. Selenium
  • C. Phosphorus
  • D. Sodium
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Correct Answer: Option B
Explanation

While standard chemical definitions usually limit metalloids to a list of six elements (Boron, Silicon, Germanium, Arsenic, Antimony, and Tellurium), Selenium is frequently classified as a metalloid in various educational contexts and standardized tests because it exhibits intermediate properties between metals and nonmetals. Though more strictly defined as a nonmetal in some academic circles, it is the only viable answer among the choices provided that displays "metalloid-like" or semiconducting behavior.


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