Question detail
Which of the following elements is classified as a noble gas?
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. Oxygen
- B. Helium
- C. Sodium
- D. Chlorine
Answer
Helium
Explanation
Helium is a noble gas, characterized by its full outer electron shell, while the other options are not noble gases.
Common mistake
Misunderstanding Electron Arrangement
Students often confuse the number of outer electrons with the atomic number when explaining how reactions of elements relate to electron arrangement.
Emphasize that the atomic number indicates the number of protons and thus the total number of electrons in a neutral atom, while the outer electron count specifically determines the element's reactivity.
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