| Group | ||||
|---|---|---|---|---|
| 2 | f1 | f2 | ||
| 6 |
57
La
Lanthanum
[Xe] 6s2 5d1
|
|||
| Period | 7 |
88
Ra
Radium
[Rn] 7s2
|
89
Ac
Actinium
[Rn] 7s2 6d1
Name origin:
the Greek 'actinos', meaning a ray
Atomic weight (amu):
227.0
Specific heat capacity (J/gK):
0.12
Density (g/cm3):
10.07
Melting point (K):
1323.0
Boiling point (K):
3471.0
Electronegativity (Pauling):
1.1
Abundance (mg/kg):
0.001
|
90
Th
Thorium
[Rn] 7s2 6d2
|
Tip: Hover over an adjacent element to compare its electron configuration to that of the central element.