What particle or nucleus X is needed to complete the following equation? 
Definitions:
Exposures
Contact with potentially harmful physical, chemical, or biological agents, either inadvertently or in a controlled manner for scientific study.
Malpractice
A failure by a professional to provide services with the competently expected level of skill or care, resulting in harm or injury to a person.
Bad Practice
Actions or behaviors, especially in professional settings, that are considered incorrect, unethical, or detrimental to clients or the profession itself.
Medical Treatment
The management and care of a patient to combat disease or disorder, including the administration of medication, surgery, therapy, or other corrective measures.
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