Input interpretation
radioactive elements | atomic radius
Summary
median | 175 pm highest | 215 pm (radium) lowest | 120 pm (radon) distribution | | (based on 13 values; 24 unavailable)
Entities with missing values
berkelium | bohrium | californium | copernicium | curium | darmstadtium | dubnium | einsteinium | fermium | francium | ... (total: 24)
Plot
Plot
Periodic table location
Periodic table location
Atomic radii properties
atomic radius (empirical) | median | 180 pm | highest | 215 pm (radium) | lowest | 135 pm (technetium) | distribution | atomic radius (calculated) | median | 135 pm | highest | 205 pm (promethium) | lowest | 120 pm (radon) | distribution | covalent radius | median | 190 pm | highest | 260 pm (francium) | lowest | 140 pm (polonium) | distribution |
Units
Distribution plots
(atomic radius in picometers)
Atomic radius rankings
1 | radon | 120 pm 2 | astatine | 127 pm 3 | technetium | 135 pm 4 | uranium | 175 pm 5 | plutonium | 175 pm 6 | neptunium | 175 pm 7 | americium | 175 pm 8 | thorium | 180 pm 9 | protactinium | 180 pm 10 | promethium | 185 pm 11 | polonium | 190 pm 12 | actinium | 195 pm 13 | radium | 215 pm (based on 13 values; 24 unavailable)
Unit conversions for median atomic radius 175 pm
0.175 nm (nanometers)
1.75×10^-10 meters
6.89×10^-9 inches
1.75 Å (ångströms)
Comparisons for median atomic radius 175 pm
≈ 5.6 × atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 7 × atomic radius of hydrogen ( ≈ 25 pm )