Ontario Grade 9 Science Class Practice Exam

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What defines a metalloid?

  1. An element that conducts heat but not electricity

  2. An element that has properties of both metals and non-metals

  3. A mixture of metals

  4. A substance with more electrons than protons

The correct answer is: An element that has properties of both metals and non-metals

Metalloids are elements that have characteristics of both metals and non-metals. This means that they have the ability to conduct heat and electricity to varying degrees, as well as exhibit properties such as malleability or brittleness. Option A is incorrect because many metalloids can actually conduct both heat and electricity. Option C is incorrect because metalloids are not a mixture of metals, but rather their own unique group on the periodic table. Option D is incorrect because having more electrons than protons is not a defining feature of metalloids. Only option B accurately describes the defining characteristics of metalloids.

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