Question

What is the atomic number of fluorine?

• A. 9
• B. 19
• C. 29
• D. 39

Hint:

Halogens belong to group 17 and have 7 valence electrons.

Answer 1

The Correct Option is A

Step 1: Recall periodic table.
Fluorine belongs to Group 17 (Halogens).
Step 2: Atomic number.
The atomic number of fluorine is 9. Its electronic configuration is \(2, 7\).
Step 3: Conclusion.
Thus, fluorine has atomic number 9.