what are bound electrons valance electron

Dear student
Please find the solution to the asked query:

Bound electrons as the name implies are bound within the shells or orbitals of the atom.
They are not free.

Valence electrons are the unbound electrons, which  are present in the outermost shell of the atom and participate in bond formation. 

For example, Na has 2,8,1 electrons 
The valence electron is the last electron and the remaining [10] electrons are bound electrons.
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