Input interpretation
big bang elements | van der Waals radius
Results
helium | 140 pm (picometers) hydrogen | 120 pm (picometers) lithium | 182 pm (picometers)
big bang elements | van der Waals radius | 140 pm (picometers) (median)
Ranked values
| | visual | ratios | 3 | hydrogen | | 0.66 | 1 2 | helium | | 0.77 | 1.17 1 | lithium | | 1 | 1.52
Plot
Plot
Periodic table location
Periodic table location
Atomic radii properties
| helium | hydrogen | lithium atomic radius (empirical) | | 25 pm | 145 pm atomic radius (calculated) | 31 pm | 53 pm | 167 pm covalent radius | 28 pm | 31 pm | 128 pm van der Waals radius | 140 pm | 120 pm | 182 pm
Units
Unit conversions for median van der Waals radius 140 pm
0.14 nm (nanometers)
1.4×10^-10 meters
5.51×10^-9 inches
1.4 Å (ångströms)
Comparisons for median van der Waals radius 140 pm
≈ 4.5 × atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 5.6 × atomic radius of hydrogen ( ≈ 25 pm )