Question
$La$ (lanthanum) having atomic number $57$ is a member of
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$CH_2(CO_2 Et)_2 $ $\xrightarrow[Et-I]{EtO^{\circleddash}} \,\,\xrightarrow[Et-I]{EtO^{\circleddash}}
\,\,\overset{Urea}{\rightarrow} $ $(P)$
