Question

9. Which of the following elements is a noble gas? A. Oxygen (0) B.

Helium (He) C. Carbon (C) D. Sodium (Na)
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Answer 1

Helium (He) is the noble gas among the options provided.

Step-by-step explanation:

The noble gas among the given options is Helium (He). Noble gases are a group of elements located in Group 18 of the periodic table. They are characterized by their low reactivity and stable electron configurations. Helium is an example of a noble gas because it has a full valence electron shell, making it unreactive.

Learn more about Noble gases