It's an element.
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Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal that is often found in salts, and is essential for various physiological functions in both plants and animals.
Sodium oxide is considered a base because it reacts with water to form a strong base, sodium hydroxide. When dissolved in water, sodium oxide produces hydroxide ions that can accept protons, making it a base according to the Brønsted-Lowry definition.
Sodium hydroxide is a base. It is a strong base that dissociates completely in water to form hydroxide ions.
Sodium chloride is a compound made up of sodium and chlorine elements. It is different from the individual elements of sodium or chlorine. Sodium is a highly reactive metal, while chlorine is a toxic greenish-yellow gas. When combined in the compound sodium chloride, they form common table salt.
Lye is a strong alkali compound, not an acid. It is typically composed of sodium hydroxide or potassium hydroxide, which are both bases.
No, salt is not always an ionic compound. It can be an ionic compound, like sodium chloride (NaCl), but it can also be a covalent compound, like sodium acetate (CH3COONa). The classification of salt as ionic or covalent depends on the elements involved and their bonding.