Question detail
Which of the following elements is classified as a halogen?
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. Fluorine
- C. Sodium
- D. Calcium
Answer
Fluorine
Explanation
Fluorine is a halogen, which is part of Group 7 in the periodic table.
Common mistake
Misunderstanding Halogen Electron Configuration
Students often state that halogens have eight electrons in their outer shell instead of seven.
Remember that halogens have seven electrons in their outer shell, which is why they are reactive and tend to gain one electron to achieve a full outer shell.
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