Massa atom saka unsur kimia yaiku massa siji atom ing kaanan meneng, lumrahé dinyatakaké sajeroning ékan massa atom. Massa atom sok disinonimaké karo massa atom relatif, massa atom rata-rata, lan berat atom. Sanadyan mangkono, ana bédané sethithik amarga aji-aji mau bisa wujud rata-rata bobot saka massa kabèh isotop unsur, utawa massa saka siji isotop waé.

Pranala njaba 

 Atomic masses of all isotopes
 IUPAC goldbook definition of atomic mass 
 IUPAC goldbook definition of relative atomic mass & atomic weight 
 Tutorial on the concept and measurement of atomic mass 

Sifat kimia
Massa