Fluorine Valence Electrons
Why fluorine has 7
Fluorine has 9 electrons, arranged as 1s2 2s2 2p5. The highest shell is n = 2, holding 2s2 2p5, so 2 + 5 = 7.
Fluorine is in group 17; for groups 13–18 subtract 10 from the group number.
What that means for bonding
Fluorine needs 1 more electron to complete an octet, so it tends to gain one (forming F−) or share one in a single covalent bond.
Electrons per shell: 2, 7. See the fluorine electron configuration and orbital diagram or the full fluorine data sheet.
Same group, same count
Fluorine valence electrons FAQ
How many valence electrons does fluorine have?
Fluorine has 7 valence electrons. Its electron configuration is 1s² 2s² 2p⁵, and the outermost shell (n = 2) holds 2s² + 2p⁵.
How do you find the valence electrons of fluorine?
Fluorine is in group 17; for groups 13–18 subtract 10 from the group number.
How many bonds does fluorine form?
Fluorine needs 1 more electron to complete an octet, so it tends to gain one (forming F−) or share one in a single covalent bond.
What is the Lewis dot structure of fluorine?
The symbol F with 7 dots around it, one per valence electron, placed singly on each side before any side is paired.
How many core electrons does fluorine have?
2: 9 electrons in total minus the 7 valence electrons.