The temperature versus concentration dependences of the magnetic susceptibility of liquid Fe, Ce; Co, Ce; Ni, Ce; Fe, Pr; Co, Pr; Ni, Pr; Fe, Sm; Fe, La; Co, La; and Ni, La alloys are given. Measurements are made by the Faraday method with the automatic pendulum scale in the temperature range from the melting point to 1650°C and REM concentrations of 0 to 100%. It is estimated that the concentration dependences of the magnetic susceptibitity have minima near equiatomic composition as a rule. The valent conditions of Ce, Pr, and Sm atoms in their alloys with Fe, Co, and Ni are estimated on the basis of the experimental data. It is found that the Ce atom valence in liquid alloys with Fe, Co, Ni, and also of Pr in melts with Co and Ni increases with increasing 3d‐metal concentration. It is noted that the delocalization effects in melts are more obvious that in the similar solid systems.