Van der Waal's Radii

Element/Group
Radius (Å)
Hydrogen 1.20
Boron 2.00
Carbon 1.70
Methyl (CH3) 2.00
Methylene (CH2) 2.00
Nitrogen 1.55
Oxygen 1.52
Fluorine 1.47
Silicon 2.10
Chlorine 1.75
Bromine 1.85
Iodine 1.98
Lithium 1.82
Sodium 2.27
Potassium 2.75