C, The atomic mass. This could also cause certain elements (i.e. Uranium, Plutonium) to radioactively decay in process called nuclear fission.
Boron trifluoride/Molar mass
67.81 g/mol
At the physically impossible-to-reach temperature of zero<span> kelvin, or minus 459.67 degrees Fahrenheit (minus 273.15 degrees Celsius), atoms would stop moving. As such, nothing can be colder than </span>absolute zero<span> on the Kelvin scale</span>
