What is the missing symbol in this plutonium fission reaction? 
Definitions:
Piaget's
Piaget's refers to the developmental theory formulated by Jean Piaget, which outlines how children's cognitive abilities evolve through distinct stages as they grow.
Elisabeth Kübler-Ross
A Swiss-American psychiatrist best known for her groundbreaking work on the five stages of grief.
Three Stages
Refers generally to models or theories that divide a process or series of events into three distinct phases, but requires context to specify which model or process.
Sexually Transmitted Disease
Infections that are primarily spread through sexual contact, affecting both men and women.
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