The Aufbau principle


Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Cs
Ba
La
Hf
Ta
W
Re
Os
Ir 
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Ac
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr

Click on the element above to see the arrangement of electrons in the boxes on the right.

[Only the first 36 elements are needed for IB HL]


 
 
 
5s
 
4p
 
4s
3d
 
 
3p
 
3s
 
 
2p
 
2s
 
 
 
1s 
 

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