Input interpretation
radium | atomic radius
Result
215 pm (picometers)
Periodic table location
Periodic table location
Atomic radii properties
atomic radius (empirical) | 215 pm covalent radius | 221 pm
Units
Unit conversions
0.215 nm (nanometers)
2.15×10^-10 meters
8.46×10^-9 inches
2.15 Å (ångströms)
Comparisons as atomic radius
≈ 6.9 × atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 8.6 × atomic radius of hydrogen ( ≈ 25 pm )