21. They are termed lanthanide because the lighter elements in the series are chemically similar to lanthanum . 22. The lanthanum plutonium oxide was next collected and extracted with nitric acid to form plutonium nitrate. 23. Three group 3 elements occur naturally, scandium, yttrium, and either lanthanum or lutetium. 24. In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium. 25. Lanthanum -140 is a decay product of barium-140, a common fission product.26. A more sensitive test uses lanthanum nitrate with iodine and ammonia to give a blue solution. 27. Leitz laboratories discovered that lanthanum ( III ) oxide can be a suitable thorium dioxide replacement. 28. These elements are vanadium, rubidium, indium, lanthanum , europium, rhenium and lutetium. 29. Of all the rare-earth sulfides, lanthanum gives the largest range of vitreous compositions. 30. 9 . Optical Band gap on wurtzite Zinc Sulphide nanocrystallites doped with lanthanum ions ( Proce.
