The electrons present in the outermost shell of an atom?

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Solution

Valence electrons
Definition:
Valence electron is an outermost shell electron that’s associated with an atom, that participate in the formation of a chemical bond.
Element Atomic Number Electronic configuration Valence electrons
Lithium (Li) 3 2,1 1
Beryllium (Be) 4 2,2 2
Neon (Ne) 10 2,8 8
Chlorine (Cl) 17 2,8,7 7
Aluminium (Al) 13 2,8,3 3
Potassium (K) 19 2,8,8,1 1

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