Mass number of silver

The mass number of an atom is the total number of protons and neutrons in its nucleus. For silver (Ag), the most common isotope is Silver-107, which has 47 protons and 60 neutrons. Therefore, its mass number is 107. Another stable isotope is Silver-109, with 47 protons and 62 neutrons, giving it a mass number of 109.

The mass number of silver is typically considered to be $\boxed{\text{107 or 109}}$ depending on the isotope.