How many lone pairs of electrons need to be added to complete this Lewis structure? 
Definitions:
Molecular Tags
Specific molecules or biochemical markers that are attached to certain proteins or DNA/RNA sequences, enabling their identification and tracking within cellular processes.
Neurotransmitter Levels
The concentration of chemicals in the brain that transmit signals across synapses between neurons, influencing mood, thought processes, and behavior.
Serotonin
A chemical messenger in the brain that promotes sensations of happiness and overall well-being.
Antidepressant Drugs
Medications prescribed to alleviate symptoms of depression by adjusting chemical imbalances in the brain neurotransmitters.
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