The Relative atomic mass of an atom is the average mass of naturally occurring isotopes, compared carbon (C-12)
1a.m.u= 1.66053906660 x 10−27kilograms.1.66053906660 \: x \: 10^{-27} kilograms.1.66053906660x10−27kilograms.1.66053906660 x 10−27 kilograms.1.66053906660 \: x \: 10^{-27} \: kilograms.1.66053906660x10−27kilograms.
a.m.u is Atomic mass unit
