Which of these structures has two nonbonding pairs of electrons? 
Definitions:
Thrombin
A blood plasma enzyme that initiates blood clotting by transforming fibrinogen into fibrin.
Thromboplastin
A plasma protein that catalyzes the conversion of prothrombin to thrombin, playing a crucial role in the blood clotting process.
Serum
The liquid portion of blood that remains after clotting, containing electrolytes, antibodies, antigens, and other soluble substances.
Thrombin
An enzyme in blood plasma that causes the clotting of blood by converting fibrinogen to fibrin.
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