Lanthanoids
| Atomic number | Name | Symbol | Electronegativity |
| 57 | Lanthanum | La | 1.1 |
| 58 | Cerium | Ce | 1.12 |
| 59 | Praseodymium | Pr | 1.13 |
| 60 | Neodymium | Nd | 1.14 |
| 61 | Promethium | Pm | 1.13 |
| 62 | Samarium | Sm | 1.17 |
| 63 | Europium | Eu | 1.2 |
| 64 | Gadolinium | Gd | 1.2 |
| 65 | Terbium | Tb | 1.1 |
| 66 | Dysprosium | Dy | 1.22 |
| 67 | Holmium | Ho | 1.23 |
| 68 | Erbium | Er | 1.24 |
| 69 | Thulium | Tm | 1.25 |
| 70 | Ytterbium | Yb | 1.1 |
| 71 | Lutetium | Lu | 1.27 |
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