8 2 5 18 July 8, 2019 16 32 64 128 8 2 5 x 18 1 3 2 8 18 5 electron configuration 2 8 18 5 element 18 1 8 2 5 2 3 8 5 18 5 √ 8 2 √ 18 8 5 2 18 is rational 8 2 5 times 18 1 3 8 2 5 plus 18 1 3 8 2 5 x 18 1 3 as a fraction N 2 8 5 18 Is 8 5 2 18 rational justify 2 5 8 182 12 8 (- 2 3x )+ 5 18x Configurazione elettronica 2 8 18 5