Ontario Grade 9 Science Class Practice Exam

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Which elements are classified as noble gases?

Elements in Group 18 of the periodic table
All gaseous elements that are non-metallic
Elements that are metalloids
Elements that are mostly found as gases in the atmosphere

The correct answer is: Elements in Group 18 of the periodic table

Noble gases are a group of elements located in Group 18 of the periodic table. These elements have the common property of having a complete valence electron shell, making them highly stable and unreactive. This group includes Helium, Neon, Argon, Krypton, Xenon, and Radon. Option B is incorrect because not all gaseous elements are classified as noble gases. For example, Hydrogen, Nitrogen, Oxygen, and Fluorine are also gaseous elements but do not fall into the noble gas category. Option C is incorrect because metalloids are elements that have properties of both metals and non-metals, and do not necessarily have to be gases. Option D is incorrect because while noble gases are mostly found as gases in the atmosphere, there are also noble gases that are commonly found in liquid form such as Helium. Additionally