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What is the symbol of the element that is classified as an alkali metal and is in period 4?
Political Discussion
The deliberation and exchange of views and opinions about political issues, policies, and current events.
Land Expansion
The process of a country or state increasing its territory through annexation, purchase, conquest, or exploration.
Western Advancement
The expansion and development of territories and communities in the western part of the United States, particularly during the 19th century.
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