Question detail
Which noble gas has only two electrons in its outer shell?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The periodic table
Question
- A. Neon
- B. Argon
- C. Helium
- D. Krypton
Answer
Helium
Explanation
Helium is the only noble gas with two electrons in its outer shell, while the others have eight.
Common mistake
Misunderstanding Noble Gas Properties
Students often predict that noble gases will react similarly to alkali metals because they are both in the periodic table.
Emphasize that noble gases are unreactive due to their stable electron arrangements, unlike alkali metals which have one electron in their outer shell and readily react.
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