In this research work, MgO nanoparticles were synthesized by a single-step coprecipitation approach using Kappaphycus alvarezii extract as stabilizer. The exhibit cubic crystal structure, which confirmed XRD and FTIR. purity of nanomaterials was P-XRD. diffraction crests are in accordance with customary patterns pure (JCPDS No.00–004-0821). Electron microscopic analysis demonstrated the appeara...