Which element indicated by letter in the following periodic table reacts rapidly with water to form an alkaline solution? 
Definitions:
Gender Equality
The state in which access to rights or opportunities is unaffected by gender, advocating for the same treatment and opportunities for all genders.
Plural Marriages
A marriage system in which an individual has more than one spouse simultaneously, known as polygamy.
Mormons
Members of The Church of Jesus Christ of Latter-day Saints, a religious group founded in the United States in the early 19th century.
Theocratic Hierarchy
A system of governance where religious leaders hold the highest authority, and the state's legal and moral codes are based on religious laws.
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