`{:(,"ColumnI",,"ColumnII"),((A),"Orbital angular momentum of an electron",(P),sqrt(s(s+1))(h)/(2pi)),((B),"Angular momentum of an electron in an orbit",(Q),sqrt((n(n+2)))),((C),"Spin angular momentum of an electron",(R),(nh)/(2pi)),((D),"Magnetic moment of atom",(S),sqrt((l(l+1)(h)/(2pi)))):}`