American physical chemist Gilbert N. Lewis laid the foundation of valence bond theory; he was instrumental in developing a bonding theory based on the number of electrons in the outermost "valence" shell of the atom.
Ahli kimia fisik Amerika Gilbert N. Lewis meletakkan dasar teori ikatan valensi; dia berperan penting dalam mengembangkan teori ikatan berdasarkan jumlah elektron di kelopak "valensi" terluar suatu atom.