chromium
titanium
The metal with the highest melting point in the first series of transition elements is chromium.
Explanation:
In the first series of transition elements (Scandium to Zinc), chromium has the highest melting point, which is due to its unique electron configuration. Chromium exhibits a more stable configuration in its crystalline structure, leading to stronger metallic bonds. This, in turn, results in a higher melting point compared to other elements in the series.