K
Potassium
Z = 19 · Alkali Metal · 39.1 u
Basic properties
- Atomic number (Z)
- 19
- Standard atomic mass
- 39.1 u
- Category
- Alkali Metal
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| K-39 | 39 | Stable | 19039 | .80c.71c.70c |
| K-40 | 40 | 1.248e9 y | 19040 | .80c.71c |