The atomic mass of copper-63 is given as 62.930 amu. The mass number of an isotope is the total number of protons and neutrons in its nucleus. For copper-63:
- Protons in Copper: Copper has an atomic number of 29, meaning it has 29 protons.
- Neutrons: The mass number is rounded from the atomic mass (62.930) to the nearest whole number, which is 63. Subtracting the protons:
63 – 29 = 34 neutrons.
Thus, the mass number of copper-63 is 63, representing its combined protons and neutrons.
