All elements have an atomic mass relative to 12C having a mass of 12.
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Copper (Cu) has a relative Atomic Mass because it is an average value that considers the different isotopes of copper and their abundance in nature. The relative atomic mass provides a more accurate representation of the average mass of an atom of copper compared to using just the mass number of the most abundant isotope.
The relative atomic mass of Cu (copper) is approximately 63.55. This value is based on the average atomic mass of naturally occurring copper isotopes.
The atomic mass of copper (Cu) is approximately 63.55 atomic mass units (amu).
relative atomic mass
Copper is a metal element. Atomic mass of it is 64.
The relative atomic mass of helium is 4.0026.