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Because it has 11 valence electrons

Please see : Trends in the periodic table

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Wiki User

12y ago
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5mo ago

Sodium is the eleventh element because it has 11 protons in its nucleus. In the Periodic Table, elements are arranged in order of increasing atomic number, which is determined by the number of protons in the nucleus. Sodium's atomic number of 11 places it in the eleventh position in the periodic table.

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Q: Why is sodium the eleventh element?
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