Question

how many valence electrons are in an atom of the element fluorine? (1 point) two five seven eight

Explanation:

Step1: Recall electron - configuration concept

Valence electrons are the electrons in the outermost shell of an atom.

Step2: Determine fluorine's electron - configuration

Fluorine has an atomic number of 9. Its electron - configuration is 1s²2s²2p⁵.

Step3: Count valence electrons

The second shell (n = 2) is the outermost shell for fluorine, and it has 2 + 5=7 electrons.

Answer:

C. seven