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Monoclinic chromium nanoparticleswere synthesized by thermal decomposition method using CrCl₃ as precursor. It is a simple, fast and effective method.The synthesized nanoparticles were analyzed by infrared spectroscopy (IR) and nuclear magnetic resonance spectroscopy (NMR), scanning electron microscopy (SEM), and X- ray diffraction (XRD)techniques. The SEM analysis confirms the spherical shape morphology and presence of stress on the surface of the nanoparticles. The XRD analysis proves that the crystal structure ismonoclinic and the size of nanoparticles is 45.20 nm