Word: lanthanum
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...Optical glass made without silica (sand or quartz)-"almost as revolutionary," says Eastman Kodak Co., "as if someone had discovered how to make steel without iron." It is compounded of three rare metals: tantalum, tungsten, lanthanum...
...noteworthy that neutrons have been recognized as coming from elements which are the lightest of their groups in the Periodic System. Beryllium is the lightest of the earth alkali group (beryllium, magnesium, calcium, strontium, barium, radium). Boron is lightest of the earth metals (boron, aluminum, scandium, yttrium, lanthanum, actinium). Fluorine is lightest of the halogens (fluorine, chlorine, bromine, iodine and, newly recognized, alabamine...