Nitrogen - 14.0067
Potassium - 19 u
Erbium - 167.259 u
Strontium - 87.62 u
Tin - 118.71 u
Fluoride - 18.998403 u
Scandium - 44.955912 u
Ytterbium - 173.04 u
Zirconium - 91.224 u
Tellurium - 127.6 u
Sodium - 22.989769 u
Vanadium - 50.9415 u
Hafnium - 178.49 u
Molybdenum - 95.95 u
Cite xenon - 131.29 u

which atomic mass is least to greatest