Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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What are Group 8A elements commonly referred to as?

Transitional metals
Noble gases
Reactive metals
Alkaline Earth metals

The correct answer is: Noble gases

Group 8A elements are commonly referred to as noble gases. This classification includes helium, neon, argon, krypton, xenon, and radon. These gases are characterized by their complete valence electron shells, which make them extremely stable and inert. As a result, they do not readily react with other elements under standard conditions, which is a defining feature of noble gases. The term "noble" suggests that these gases are similar to noble metals, which are also resistant to corrosion and oxidation. This lack of reactivity is unlike many other classifications of elements mentioned in the other options, where transitional metals can react under various conditions, and reactive metals, as well as alkaline earth metals, are known for their high reactivity with nonmetals. Thus, identifying Group 8A elements as noble gases highlights their unique properties in comparison to other groups on the periodic table.