A small Julia package returns the atomic mass of an isotope.
To install it, open your Julia RPLE and type
]add AtomicMass.jlThere are only two exported functions in the package.
using AtomicMass
atomicmass("H")
atomicmass("H2")
atomicmass("H-2")
atomicmass("D")
atomicmass("p") # Support proton
atomicmass("e") # and electron
atomicnumber("H") # returns 1
atomicnumber("C") # returns 6