Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

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What defines a metalloid?

An element that conducts heat but not electricity

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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A mixture of metals

A substance with more electrons than protons

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