Electron  Valence Shell Location

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H                                 He
Li Be                     B C N O F Ne
Na Mg                     Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr 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 TI Pb Bi Po At Rn
Fr Ra Ac* Rf Db Sg Bh Hs Mt Uun Uuu Uub uut Uua uup Uuh uus Uuo
                                   

 

Lanthanides *Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides *Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

All Green Letters group/family 1 and 2 including Helium end in the the S block.

All Red Letters group/family 3 through 12 end in the D block.

All Yellow Letters group/family 13 through 18 excluding Helium end in the P block.

All Purple Letters are in the F block.

1

 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

1s

1s
2s

2s

 2p 2p 2p 2p 2p 2p
3s 3s 3p 3p 3p 3p 3p 3p
4s 4s 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 4p 4p 4p 4p 4p 4p
5s 5s 4d 4d 4d 4d 4d 4d 4d 4d 4d 4d 5p 5p 5p 5p 5p 5p
6s 6s 5d 5d 5d 5d 5d 5d 5d 5d 5d 5d 6p 6p 6p 6p 6p 6p
7s 7s 6d 6d 6d 6d 6d 6d 6d 6d 6d 6d 7p 7p 7p 7p 7p 7p

 

4F 4F 4F 4F 4F 4F 4F 4F 4F 4F 4F 4F 4F 4F
5F 5F 5F 5F 5F 5F 5F 5F 5F 5F 5F 5F 5F 5F