| Group | |||
|---|---|---|---|
| 1 | 2 | ||
| 4 |
19
K
Potassium
[Ar] 4s1
|
||
| Period | 5 |
37
Rb
Rubidium
[Kr] 5s1
Name origin:
the Latin 'rubidius', meaning deepest red
Atomic weight (amu):
85.4678
Specific heat capacity (J/gK):
0.363
Density (g/cm3):
1.532
Melting point (K):
312.46
Boiling point (K):
961.0
Electronegativity (Pauling):
0.82
Abundance (mg/kg):
90.0
|
38
Sr
Strontium
[Kr] 5s2
|
| 6 |
55
Cs
Cesium
[Xe] 6s1
|
||
Tip: Hover over an adjacent element to compare its electron configuration to that of the central element.