What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Spying
The act of secretly gathering confidential or sensitive information about individuals, organizations, or countries for various purposes, including security or competitive advantage.
Union Representatives
Individuals elected or appointed to act on behalf of and advocate for the members of a labor union.
Facebook Exchange
A real-time bidding ad exchange by Facebook that allows advertisers to buy and target ads at specific audiences on the social platform.
Protected Actions
Activities that employees are entitled to participate in without fear of retribution, often associated with labor rights like striking or protesting.
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