Electron-Configurations:  The f-block elements

1A 2A 3A 4A 5A 6A 7A 8A
(1) (2) (13) (14) (15) (16) (17) (18)
3B 4B 5B 6B 7B — 8B — 1B 2B
(3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
1 H He
2 Li Be B C N O F Ne
3 Na Mg Al Si P S Cl Ar
4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6 Cs Ba La   Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7 Fr Ra Ac   Rf Db Sg Bh Hs Mt Ds Rg Uub — Uuq — — — —
6   Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
7   Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

 

Atomic

Number

Symbol

Name

Electron

Configuration

Notes
58 Ce Cerium [Xe] 4f1 5d1 6s2  
59 Pr Praseodymium [Xe] 4f3 6s2 anomalous configuration
60 Nd Neodymium [Xe] 4f4 6s2 anomalous configuration
61 Pm Promethium [Xe] 4f5 6s2 anomalous configuration
62 Sm Samarium [Xe] 4f6 6s2 anomalous configuration
63 Eu Europium [Xe] 4f7 6s2 anomalous configuration
64 Gd Gadolinium [Xe] 4f7 5d1 6s2  
65 Tb Terbium [Xe] 4f9 6s2 anomalous configuration
66 Dy Dysprosium [Xe] 4f10 6s2 anomalous configuration
67 Ho Holmium [Xe] 4f11 6s2 anomalous configuration
68 Er Erbium [Xe] 4f12 6s2 anomalous configuration
69 Tm Thulium [Xe] 4f13 6s2 anomalous configuration
70 Yb Ytterbium [Xe] 4f14 6s2 anomalous configuration
71 Lu Lutetium [Xe] 4f14 5d1 6s2  
90 Th Thorium [Rn] 6d2 7s2 anomalous configuration
91 Pa Protactinium [Rn] 5f2 6d1 7s2  
92 U Uranium [Rn] 5f3 6d1 7s2  
93 Np Neptunium [Rn] 5f4 6d1 7s2  
94 Pu Plutonium [Rn] 5f6 7s2 anomalous configuration
95 Am Americium [Rn] 5f7 7s2 anomalous configuration
96 Cm Curium [Rn] 5f7 6d1 7s2  
97 Bk Berkelium [Rn] 5f9 7s2 anomalous configuration
98 Cf Californium [Rn] 5f10 7s2 anomalous configuration
99 Es Einsteinium [Rn] 5f11 7s2 anomalous configuration
100 Fm Fermium [Rn] 5f12 7s2 anomalous configuration
101 Md Mendelevium [Rn] 5f13 7s2 anomalous configuration
102 No Nobelium [Rn] 5f14 7s2 anomalous configuration
103 Lr Lawrencium  [Rn] 5f14 6d1 7s2