What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Satisfaction
The feeling of pleasure or contentment that comes from meeting or exceeding one's expectations from a product or service.
Retirement Benefits
These are forms of compensation provided to employees upon retirement, including pensions, health insurance, and other financial support.
Retirement Planning
The process of determining retirement income goals and the actions and decisions necessary to achieve those goals, including saving and investment strategies.
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