Electron is associated with three magnetic moments namely, spin angular , orbital angular and total angular momentum. Based on this, there are three g factors, electro spin g factor, orbital g-factor and Lande g factor. Spin electron g factor is defined as mus = ge(Mub / h bar)S. From this, gs is defined as |ge| = -ge. The value of this is approximately equal to 2.002319. For orbital , g value is 1 and for lande g factor it is related with gs and gl.