Input interpretation
promethium | atomic radius
Result
185 pm (picometers)
Periodic table location
Periodic table location
Atomic radii properties
atomic radius (empirical) | 185 pm atomic radius (calculated) | 205 pm covalent radius | 199 pm
Units
Unit conversions
0.185 nm (nanometers)
1.85×10^-10 meters
7.28×10^-9 inches
1.85 Å (ångströms)
Comparisons as atomic radius
≈ 6 × atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 7.4 × atomic radius of hydrogen ( ≈ 25 pm )