Who metal have a least tendency to form positive ion?

Metals that have the least tendency to form positive ions are typically found in Group 14 of the Periodic Table, such as lead and tin. These metals have a higher ionization energy compared to alkali and alkaline earth metals, making it less favorable for them to lose electrons and form cations. Additionally, transition metals with fully filled d-orbitals tend to exhibit lower reactivity and a reduced tendency to form positive ions.