In 1961, the Commission recommended Ar(Cu) = 63.54 based on the recent chemical determinations. In 1967, the Commission recommended Ar(Cu) = 63.546(1) based ...

What is the density of Cu crystal? (Atomic mass of copper =63.5 amu,NA=6.023×1023).

Isotope · Relative Atomic Mass · Isotopic · Composition · Standard Atomic Weight · Notes. 29, Cu, 63, 62.929 597 72(56), 0.6915(15), 63.546(3), r.

Copper ; 63.546±0.003 · 63.546±0.003 (abridged).

Messrs. Richards and Phillips have recently found the atomic weight of copper to be 63.557 (Ag = 107.88).

The molecular mass of copper is 63.5 g whereas the mass number is always an integer. The reason for such variation is the presence of isotopes.

Atomic Mass, 63.546 atomic mass units ; Number of Protons, 29 ; Number of Neutrons, 35 ; Number of Electrons, 29 ; Melting Point, 1083.0° C.