Our recently proposed generalized seniority scheme has been widely successful in explaining the reduced transition probabilities of high spin isomers and other excited states in semi-magic nuclei [1-5]. In the present paper, we use this formalism to obtain the g-factors of semi-magic nuclei, particularly for Sn and Pb isotopes. We find that the magnetic moment and the g-factor values do show a particle number independent behavior for a multi-j, mixed configuration states where generalized seniority is applicable, as expected by us [4]. The calculated results explain the experimental trends quite well. As a result, we further confirm that g-factors of all the states arising from a given mixed configuration having identical nucleons must be equal to the g-factor of a single nucleon in the same mixed configuration. This opens up a way to make predictions more easily. References: 1.B. Maheshwari, and A. K. Jain, Phys. Lett. B 753, 122 (2016) 2.B. Maheshwari, A. K. Jain and B. Singh, Nucl. Phys. A 952, 62 (2016) 3.A. K. Jain, and B. Maheshwari, Nuclear Phys. Review 34, 73 (2017) 4.A. K. Jain, and B. Maheshwari, Physica Scripta 92, 074004 (2017) 5.B. Maheshwari, S. Garg, and A. K. Jain, Pramana-Journal of Physics (Rapid Comm.)89, 75 (2017)