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Britannica Sources used in this answer

What is sodium’s atomic number?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
A labeled diagram shows the periodic table entry for sodium, highlighting its symbol Na, atomic number 11, atomic weight, electron configuration, physical state as a solid, body-centered cubic crystal structure, and strongly basic oxide properties.
sodium

The atomic number of sodium is 11.1