Input interpretation
alkali metals | covalent radius
Summary
median | 212 pm highest | 260 pm (francium) lowest | 128 pm (lithium) distribution |
Units
Ranked values
| | visual | ratios | 6 | lithium | | 0.492 | 1 5 | sodium | | 0.64 | 1.3 4 | potassium | | 0.78 | 1.59 3 | rubidium | | 0.85 | 1.72 2 | cesium | | 0.94 | 1.91 1 | francium | | 1 | 2.03
Plot
Plot
Periodic table location
Periodic table location
Atomic radii properties
atomic radius (empirical) | median | 220 pm | highest | 260 pm (cesium) | lowest | 145 pm (lithium) | distribution | atomic radius (calculated) | median | 243 pm | highest | 298 pm (cesium) | lowest | 167 pm (lithium) | distribution | covalent radius | median | 212 pm | highest | 260 pm (francium) | lowest | 128 pm (lithium) | distribution | van der Waals radius | median | 227 pm | highest | 275 pm (potassium) | lowest | 182 pm (lithium) | distribution |
Units
Covalent radius rankings
1 | lithium | 128 pm 2 | sodium | 166 pm 3 | potassium | 203 pm 4 | rubidium | 220 pm 5 | cesium | 244 pm 6 | francium | 260 pm
Unit conversions for median covalent radius 212 pm
0.212 nm (nanometers)
2.12×10^-10 meters
8.33×10^-9 inches
2.12 Å (ångströms)
Comparisons for median covalent radius 212 pm
≈ 6.8 × atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 8.5 × atomic radius of hydrogen ( ≈ 25 pm )