Question

caracterizati elementuol Litiu

Answer 1

Litiu - Li 
Z = 3 
A = 6,941 (7) 
                    
Li - nucleu = 3
                  = 7-3 = 4 
    - invelis electronic = $3$ $e^{-}$ -K =2 $e^{-}$ 
                                               -L =1 $e^{-}$