Examlex
The number of states in a shell with principal quantum number n = 3 is:
Natural Resources
Materials or substances occurring in nature which can be exploited for economic gain, such as minerals, forests, water, and arable land.
Megacities
Urban areas with a population exceeding 10 million people, typically experiencing significant economic, social, and infrastructural challenges and opportunities.
Estimated
Roughly calculated or approximated based on available information or data.
Planet
A celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, but not massive enough to cause thermonuclear fusion.
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