A) Lanthanum
B) Nobelium
C) Thorium
D) Cerium
Correct Answer: D
Solution :
The series involving the filling of \[4f\]-orbitals following lanthanum La (Z = 57) is called lanthanoid series. The elements present in the series are called lanthanoids. There are fourteen elements in this series starting with cerium Ce (Z = 58) and ending with lutetium Lu (Z = 71). Cerium is commonly used in manufacture of alloys of lanthanides. Cerium salts are also used in dying cotton or fabrics, for scavenging oxygen and sulphur from metals. They are also used as catalysts. Cerium-magneisum alloys are used in flash light powders.
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