Boron Valence Electrons
Why boron has 3
Boron has 5 electrons, arranged as 1s2 2s2 2p1. The highest shell is n = 2, holding 2s2 2p1, so 2 + 1 = 3.
Boron is in group 13; for groups 13–18 subtract 10 from the group number.
What that means for bonding
Boron usually shares its 3 valence electrons in covalent bonds rather than forming a 3+ ion, and its compounds (such as BF3) often end up with fewer than eight electrons around it.
Electrons per shell: 2, 3. See the boron electron configuration and orbital diagram or the full boron data sheet.
Same group, same count
Boron valence electrons FAQ
How many valence electrons does boron have?
Boron has 3 valence electrons. Its electron configuration is 1s² 2s² 2p¹, and the outermost shell (n = 2) holds 2s² + 2p¹.
How do you find the valence electrons of boron?
Boron is in group 13; for groups 13–18 subtract 10 from the group number.
How many bonds does boron form?
Boron usually shares its 3 valence electrons in covalent bonds rather than forming a 3+ ion, and its compounds (such as BF3) often end up with fewer than eight electrons around it.
What is the Lewis dot structure of boron?
The symbol B with 3 dots around it, one per valence electron, placed singly on each side before any side is paired.
How many core electrons does boron have?
2: 5 electrons in total minus the 3 valence electrons.