electronic configuration

number of orbitals in each sub shell

s - 1

P - 3

d - 57

f -

what are orbitals

• an orbital is the space which an electron moves in

• orbitals in the same sub-shell have the same energy

• there are two electrons in each orbital which spin in opposite directions

Shape of S orbital

spherical

shape of P orbital

dumbbell shape

sub-shell notation electronic configuration of neon

Electronic configuration using electrons in boxes

• each box represents one orbital and each arrow shows one electrons

• the arrows point in opposite directions as the electrons have opposite spins

order of filling the sub-shells

1s,2s,2p,3s,3p,4s,3d,4p,4d,4f

electronic configuration of chromium

(Ar) 4s1 3d5

electronic configuration of copper

(Ar) 4s1 3d10