Answer
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Step 1:I'll solve this problem step by step following the specified LaTeX formatting guidelines:
Step 2:: Identify the element
Sodium (Na) is located in Group 1 (alkali metals) of the periodic table. Its atomic number is 11.
Step 3:: Determine electron configuration
The electron configuration of sodium is $$1s^{2} 2s^{2} 2p^{6} 3s^{1}
Step 4:: Locate valence electrons
For sodium, this is the $$3s^{1}$$ electron.
In Group 1 elements, the valence electrons are the electrons in the outermost shell.
Step 5:: Count valence electrons
Sodium has $$1$$ valence electron.
Final Answer
Key Insight: - Valence electrons are the electrons in the outermost shell - For main group elements, the number of valence electrons corresponds to the group number - Sodium's single valence electron makes it highly reactive, typical of alkali metals
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