Use noble gas and spdf notations to depict electron configurations for the following metals of the third transition series.

(a) Tantalum, Ta. The metal and its alloys resist corrosion and are often used in surgical and dental tools.

(b) Platinum, Pt. This metal was used by pre-Columbian Indians in jewelry. Now it is still used in jewelry but it is also the basis for anti-cancer drugs and catalysts (such as those in automobile exhaust systems).