Boron (B) has 3 valence electrons.
Boron is in Group 13 (also known as Group IIIA) of the periodic table. Elements in Group 13 all have three valence electrons. These valence electrons are the ones in the outermost electron shell and are involved in chemical bonding. Boron's electron configuration is 1s² 2s² 2p¹, making its valence electrons 2s² 2p¹. The 2s² and 2p¹ orbitals in the second energy level contain a total of three electrons, which are the valence electrons.
