General outer electronic configuration : s-block elements : $ns^{1–2}$; e.g., Na : $3s^1$ p-block elements : $ns^2 np^{1–6}$; e.g., F : $2s^2 2p^5$ d-block elements : (n – 1) $d^{1–10} ns^{0 –2}$ ; e.g., Zn : $3d^{10}4s^2$ f-block elements : (n – 2) $f ^{1–14} (n–1) d^{0–1} ns^2$ ; e.g., Ce : $4f^1 5d^1 6s^2$.