What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Marginal Cost
The cost added by producing one additional unit of a product or service, essential for understanding profitability and production efficiency.
R&D Expenditures
Funds allocated towards research and development activities by businesses, government, or organizations.
Market Interest Rate
The prevailing rate at which borrowers are willing to borrow money and lenders are willing to lend in the financial market.
Basic Scientific Research
The initial stage of scientific inquiry aimed at gaining more comprehensive knowledge or understanding of the subject without specific applications towards processes or products in mind.
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