Input interpretation
big bang elements | covalent radius
Results
helium | 28 pm (picometers) hydrogen | 31 pm (picometers) lithium | 128 pm (picometers)
big bang elements | covalent radius | 31 pm (picometers) (median)
Ranked values
| | visual | ratios | 3 | helium | | 0.22 | 1 2 | hydrogen | | 0.24 | 1.1 1 | lithium | | 1 | 4.6
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 covalent radius 31 pm
0.031 nm (nanometers)
3.1×10^-11 meters
1.2×10^-9 inches
0.31 Å (ångströms)
Comparisons for median covalent radius 31 pm
≈ atomic radius of helium (the smallest atom) ( ≈ 31 pm )
≈ 1.2 × atomic radius of hydrogen ( ≈ 25 pm )