Florida Teacher Certification Examinations (FTCE) Subject Area Practice Test

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Which element is known as a noble gas?

Oxygen
Chlorine
Neon
Hydrogen

The correct answer is: Neon

Neon is classified as a noble gas because it belongs to Group 18 of the periodic table, which is characterized by elements that have a full outer electron shell. This configuration makes noble gases highly stable and unreactive under normal conditions. Noble gases, including neon, argon, krypton, xenon, and radon, are known for their lack of chemical reactivity due to their complete valence electron shell. This stability allows them to exist in nature as monatomic gases and not readily combine with other elements. In contrast, the other elements listed, such as oxygen and chlorine, are nonmetals that readily react with other elements to form compounds. Hydrogen is a unique element that can act as a nonmetal and can form bonds with various other elements, but it does not have the stable electronic configuration characteristic of noble gases. Thus, neon stands out as the correct answer due to its noble gas properties.