●物理化学 3-1 Covalence bond Theory W.Kossel: one or more electrons from one atom atls are removed and attached c my D dfna to another atom, resulting in positive and negative g ae de ions which attract each 几kx other--c-ionic binding G W.Lewis: one or more pairs ofelectrons are shared by two atoms covalent binding G W.Lewis 2021/8/21 复旦大学化学系物理化学I 2021/8/21 复旦大学化学系 4 W.Kossel : one or more electrons from one atom are removed and attached to another atom, resulting in positive and negative ions which attract each other----ionic binding G.W.Lewis: one or more pairs of electrons are shared by two atoms ---- covalent binding 3-1 Covalence bond Theory G.W.Lewis