Electronic Configurations and Radii of Lanthanum and Lanthanoids
Element Symbol Atomic Number Electronic Configuration Ionic Radius (III) (pm)
Atomic
Lanthanum La 57 [Xe] 5d1 6s2 103
Cerium Ce 58 [Xe] 4f1 5d1 6s2 101
Praseodymium Pr 59 [Xe] 4f3 6s2 99
Neodymium Nd 60 [Xe] 4f4 6s2 98
Promethium Pm 61 [Xe] 4f5 6s2 97
Samarium Sm 62 [Xe] 4f6 6s2 95
Europium Eu 63 [Xe] 4f7 6s2 95
Gadolinium Gd 64 [Xe] 4f7 5d1 6s2 93
Terbium Tb 65 [Xe] 4f9 6s2 92
Dysprosium Dy 66 [Xe] 4f10 6s2 91
Holmium Ho 67 [Xe] 4f11 6s2 90
Erbium Er 68 [Xe] 4f12 6s2 89
Thulium Tm 69 [Xe] 4f13 6s2 88
Ytterbium Yb 70 [Xe] 4f14 6s2 86
Lutetium Lu 71 [Xe] 4f14 5d1 6s2 85
Element Symbol Atomic Number Electronic Configuration Ionic Radius (III) (pm)
Atomic
Lanthanum La 57 [Xe] 5d1 6s2 103
Cerium Ce 58 [Xe] 4f1 5d1 6s2 101
Praseodymium Pr 59 [Xe] 4f3 6s2 99
Neodymium Nd 60 [Xe] 4f4 6s2 98
Promethium Pm 61 [Xe] 4f5 6s2 97
Samarium Sm 62 [Xe] 4f6 6s2 95
Europium Eu 63 [Xe] 4f7 6s2 95
Gadolinium Gd 64 [Xe] 4f7 5d1 6s2 93
Terbium Tb 65 [Xe] 4f9 6s2 92
Dysprosium Dy 66 [Xe] 4f10 6s2 91
Holmium Ho 67 [Xe] 4f11 6s2 90
Erbium Er 68 [Xe] 4f12 6s2 89
Thulium Tm 69 [Xe] 4f13 6s2 88
Ytterbium Yb 70 [Xe] 4f14 6s2 86
Lutetium Lu 71 [Xe] 4f14 5d1 6s2 85
