| Isotope | Atomic mass (Da) | Isotopic abundance (amount fraction) |
|---|---|---|
| 63Cu | 62.929 597(3) | 0.6915(15) |
| 65Cu | 64.927 790(5) | 0.3085(15) |
Atomic Number: 29: Atomic Mass: 63.546 atomic mass units: Number of Protons: 29: Number of Neutrons: 35: Number of Electrons: 29: Melting Point: 1083.0° C: Boiling Point: 2567.0° C. Copper beads dating back to 9000 B.C. Were found in Iraq: Common Compounds: Copper chloride (CuCl 2) Copper cyanide (CuCN). Copper gluconate and copper sulfate were reported to be used as nutrients in milk products, processed fruit juices and drinks, soft candy, snack foods, beverages, chewing gum, and baby and infant formula. In addition, copper sulfate was reported to be used as a processing aid in alcoholic beverages.
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 on the mass-spectrometric measurements. The recommended uncertainty was increased to 0.003 in 1969 to include natural variations of up to approx. 0.15 % in the isotopic abundances of copperisotopes, and given the annotation 'r' to indicate that the precision was limitedby natural variability.
In the compilation by the Commission, the lowest reported δ65Cu value in a naturallyoccurring sample is −7.65 ‰ (x(65Cu) = 0.3066 and Ar(Cu) = 63.542) for a specimenof a Cu-chloride mineral (atacamite) from Chile. The highest reported δ65Cu is +9 ‰ (x(65Cu) = 0.3102 and Ar(Cu) = 63.549) for a Cu-carbonate mineral (aurichalcite) from Arizona. Some of these values are outside the range of the stated atomic-weight uncertainty andmay justify a re-evaluation by the Commission of the atomic-weight uncertainty or annotations
© IUPAC 2003
CIAAW
Copper
Ar(Cu) = 63.546(3) since 1969
The name derives from the Latin cuprum for Cyprus, the island where the Romans first obtained copper.The symbol Cu also comes from the Latin cuprum. The element has been known since prehistoric times.
Isotopic reference materials of copper.
Source: 'Properties of Copper and Copper Alloys at Cryogenic Temperatures' by N.J. Simon, E.S. Drexler, and R.P. Reed ( NIST MN 177)
General and Atomic Properties of Copper
| Atomic Number | 29 |
| Atomic Weight | 63.546 |
| Atomic Diameter | 2.551 x 10 -10m |
| Melting Point | 1356 K |
| Boiling Point | 2868 K |
| Density at 293 K | 8.94 x 10 3 kg/m 3 |
| Electronic Structure | 3d 104s |
| Valence States | 2,1 |
| Fermi Energy | 7.0 eV |
| Fermi Surface | spherical, necks at [111] |
| Hall Coefficient | -5.12 x 10 -11 m 3/(A .S) |
| Magnetic State | diamagnetic |
| Heat of Fusion | 134 J/g |
| Heat of Vaporization | 3630 J/g |
| Heat of Sublimation @ 1299 K | 3730 J/g |
Copper Atomic Number Configuration
Crystallographic Features of Copper
Copper-64 Atomic Number
| Type of Structure | A1 |
| Space Group | O h5 - Fm3m |
| Crystal Structure | face-centered cubic |
| Number of Atoms per Unit Cell | 4 |
| Lattice Parameters at 293 K | 3.6147 x 10 -10 m |
| Distance of Closest Atomic Approach (Burgers vector) at 293 | 2.556 x 10 -10m |
| Goldschmidt Atomic Radii (12-fold coordination) | 1.28 x 10 -10m |
| Atomic Volume | 1.182 10 -29m 3 |