This question refers to the figure shown. Which one of the following concepts explains why heavy nuclei do not follow the N = Z line (or trend) in the figure? 
Definitions:
Espirit de Corps
A feeling of pride, fellowship, and loyalty shared by members within a group or organization.
Mary Parker Follett
An early 20th-century social worker and management consultant known for her theories on democratic organization and the power of collective action.
Multiculturalism
The recognition, acceptance, and promotion of multiple cultural traditions within a single jurisdiction, fostering diversity and inclusivity.
Systems
Sets of interrelated components working together toward a common goal, whether in computer science, biology, or organizational theory.
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