a, $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^5$
b, $1s^2 2s^2 2p^6 3s^2 3p^3$
c, $1s^2 2s^2 2p^6 3s^2 3p^4$
d, $1s^2 2s^2 2p^6 3s^2 3p^2$
e, $1s^2 2s^2 2p^6 3s^2 3p^5$
f, $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$
Hoặc các trường hợp:
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^1 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^7 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^1$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^2$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^3$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^4$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^5$
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6$
g, $1s^2 2s^2 2p^6 3s^2 3p^1$
