Question

exit ticket: lewis dot diagrams practice give the correct number of valence electrons for the element fluorine, f, atomic #9

Explanation:

Step1: Recall electron - shell filling

Electrons fill shells in a specific order. The first shell can hold 2 electrons and the second shell can hold 8 electrons.

Step2: Determine electron configuration of fluorine

Fluorine has an atomic number of 9. Its electron configuration is 2, 7. The first shell has 2 electrons and the second shell (valence shell) has 7 electrons.

Answer:

7