Atoms donate electrons to achieve stability. The strongest donors have polarizable atoms and less electronegative ions.
Atoms often gain, lose, or share electrons to achieve the same number of electrons as the noble gas closest to them in the periodic table. Donating electrons involves less number of electrons, making it more favorable. The strongest o-donors are typically those with more polarizable donor atoms like S, P, I, and less electronegative donor ions such as C and H.
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