Input interpretation
![helium | atomic radius](../image_source/fe1c6d8d3387b7852c948a548458c860.png)
helium | atomic radius
Result
![31 pm (picometers)](../image_source/9432bf4d67482c0cec6c59115ae0a8aa.png)
31 pm (picometers)
Periodic table location
![Periodic table location](../image_source/1834ec3ae7e9890026db21452a97443b.png)
Periodic table location
Atomic radii properties
![atomic radius (calculated) | 31 pm covalent radius | 28 pm van der Waals radius | 140 pm](../image_source/a75836554a5f8725b0178111ef6b0d43.png)
atomic radius (calculated) | 31 pm covalent radius | 28 pm van der Waals radius | 140 pm
Units
Unit conversions
![0.031 nm (nanometers)](../image_source/3b10b75268335a63adae18a5b7dd3bf2.png)
0.031 nm (nanometers)
![3.1×10^-11 meters](../image_source/14c03fe14111e893fd76192cce9ac330.png)
3.1×10^-11 meters
![1.2×10^-9 inches](../image_source/131333efadbf834f9c529cedbf41c07d.png)
1.2×10^-9 inches
![0.31 Å (ångströms)](../image_source/ca8eb8258dee2c6eacb42eac0c7dbdba.png)
0.31 Å (ångströms)
Comparisons as atomic radius
![≈ atomic radius of helium (the smallest atom) ( ≈ 31 pm )](../image_source/340cbaa756bfd2169b8654752e40b075.png)
≈ atomic radius of helium (the smallest atom) ( ≈ 31 pm )
![≈ 1.2 × atomic radius of hydrogen ( ≈ 25 pm )](../image_source/e0c2cfb64950fae9f649f6f9b7f7f160.png)
≈ 1.2 × atomic radius of hydrogen ( ≈ 25 pm )