Potassium gluconate

KC6H11O7, an odourless, white crystalline compound with salty taste; soluble in water, insoluble in alcohol and benzene; used in medicine.

Potassium hydride (KH)

Refers to a white ionic solid prepared by passing hydrogen over heated potassium, the metal being suspended in am inert medium. It is an excellent reducing agent.

Potassium iodate (KIO₃)

A white solid formed either by adding iodine to a hot concentrated solution of potassium hydroxide or by the electrolysis of potassium iodide solution. NO hydrates are known. It is a source of iodide and iodic acid.

Potassium nitrite (KNO₂)

refers to a creamy deliquescent slid that is readily soluble in water. Potassium nitrite is used in organic chemistry in the process of diazotization.

Potassium sulphite

K₂SO₃.2H₂O, water-soluble, white crystals; used in medicine and photography.

Potassium tetraiodocadmate

K₂(CdI4).2H₂O, a crystalline compounds; used in analytical chemistry for alkaloids, amines, and other compounds. Also known as cadmium potassium iodide; potassium iodide; potassium cadmium iodide.

Promethium

Symbol Pm, a soft silvery metallic element belonging to the lanthanoids; a.n. 61; r.a.m. 145; r.d. 7.26 (200C); m.p. 10420C; b.p. 30000C. The only naturally occurring isotope, promethium¾147, has a half-life of only 2.52 years. Eighteen other radioisotopes are but they are having very short half-lives. The only known source of the elements has been nuclear waste material Promethium¾147 is of interest as a beta-decay power source but the promethium-146 and 148, which emit penetrating gamma radiation, must first be removed. It was discovered by J.A. Mariesky, L.E. Glendenin, and C.D. Coryell in 1947.