The atomic mass of copper is 63.546 amu. Do any copper isotopes have a mass of 63.546 amu? Briefly explain.

copper has about 30 isotopes (see wiki), two of which are stable

the atomic mass is the weighted average of the two stable isotope masses

To determine if any copper isotopes have a mass of 63.546 amu, we can look at the atomic masses of different copper isotopes. The atomic mass of an element is the weighted average of the masses of its isotopes, where the weights are the relative abundance of each isotope.

Copper has two stable isotopes: copper-63 and copper-65. The atomic mass of copper is a weighted average of these isotopes' masses, and it is close to 63.546 amu. However, it's important to note that the atomic mass of copper is not exactly equal to the mass of any single isotope.

Copper-63 has a mass of approximately 62.9296 amu, and copper-65 has a mass of approximately 64.9278 amu. Since neither of these masses is exactly 63.546 amu, we can conclude that no single copper isotope has a mass of 63.546 amu.

The atomic mass of copper being close to 63.546 amu indicates that copper-63 is more abundant than copper-65 since it has a lower mass. The relative abundance of isotopes influences the atomic mass, and in the case of copper, this results in an atomic mass close to the mass of copper-63.