Ontario Grade 9 Science Class Practice Exam

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Describe non-metals.

  1. Elements that are lustrous, malleable, and conduct electricity

  2. Substances that are made up of at least two different types of particles

  3. Elements, usually gas or a dull powdery solid, that do not conduct heat or electricity

  4. A mixture of noble gases

The correct answer is: Elements, usually gas or a dull powdery solid, that do not conduct heat or electricity

Non-metals are a group of elements on the periodic table that do not possess the typical characteristics of metals. This means that they are not lustrous (shiny), malleable (able to be hammered into shape), or conduct electricity. These elements are usually in the form of a gas or a dull powdery solid. This description rules out options A and B, as they describe properties that are not true for non-metals. Option D is also incorrect, as noble gases are a specific group of elements and not a mixture.

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