Sodium; 12. Magnesium; 13. Aluminium; 14. Silicon; 15. Phosphorus
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Sodium is a chemical element with symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged ion—the Na⁺ cation.
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