Electronic Configurations of Atoms Valence electrons are electrons on the outermost shell of the atom. TABLE 1-1 Electronic Configurations of the Elements of the First and Second Rows Element Configuration Valence Electrons H 16 1 He 152 2 Li 1522 1 Be 1522 2 B 12222p 3 0 12222p2p 4 N 1s2222p2p2p 5 0 1s2222p2p2p 6 12222p22p2p 1 Ne 1s222p2p2 8 Chapter 1 12 Electronic Configurations of Atoms • Valence electrons are electrons on the outermost shell of the atom. Chapter 1 12