Question

How many valence electrons are in an atom of the element fluorine?

5
2
7
8

Answer 1

Fluorine has 7 valence electrons. The atomic number of fluorine is 9, which means it has 9 electrons. The electron configuration of fluorine is 1s² 2s² 2p⁵, indicating that there are 5 electrons in the 2p subshell and 2 electrons in the 2s subshell, giving a total of 7 valence electrons. Therefore, the correct answer is **7**.