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Q.

[[1]] valence electrons are present in sodium with atomic number 11.

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answer is 1.

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Detailed Solution

Valence electrons are the electrons present in the outermost shell of an atom. 

Consider sodium with atomic number 11. The electronic configuration can be written as 2, 8, 1. Three shells are filled in sodium. 

The last shell contains one electron only. Therefore, the number of valence electron present is 1.

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