| Group | ||||
|---|---|---|---|---|
| f5 | f6 | f7 | ||
| Period | 6 |
61
Pm
Promethium
[Xe] 6s2 4f5
|
62
Sm
Samarium
[Xe] 6s2 4f6
Name origin:
Samarskite, the name of the mineral from which it was first isolated
Atomic weight (amu):
150.36
Specific heat capacity (J/gK):
0.197
Density (g/cm3):
7.52
Melting point (K):
1345.0
Boiling point (K):
2067.0
Electronegativity (Pauling):
1.17
Abundance (mg/kg):
7.05
|
63
Eu
Europium
[Xe] 6s2 4f7
|
| 7 |
94
Pu
Plutonium
[Rn] 7s2 5f6
|
|||
Tip: Hover over an adjacent element to compare its electron configuration to that of the central element.