Quanti elettroni di valenza ha # Al #?
Risposta:
3 elettroni
Spiegazione:
Aluminum is the third element in the third row of la tavola periodica. The outermost orbitals to be filled are 3s and 3p. The 3s orbital fills before the 3p orbitals. So, the configurazione elettronica is #[Ne]3s^2 3p^1#. Just by looking at the electron configuration, you see that there are three elettroni di valenza.