Which element indicated by letter in the following periodic table reacts rapidly with water to form an alkaline solution? 
Definitions:
Local Merchant
An individual or business that sells goods or services within a particular local area or community.
Bargaining Unit
A group of employees with a clear and identifiable community of interests who are represented by a single labor union in bargaining and negotiations.
Certification
An official recognition or guarantee that an individual, product, or organization meets certain standards or qualifications.
Lawful Strike
A work stoppage by unionized workers that is legally permitted and adheres to labor laws.
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