# What is the average of the mass numbers of the isotopes of an element called?

Nov 25, 2016

$\text{The atomic mass.......}$
The quoted atomic mass for palladium metal is $106.42 \cdot g \cdot m o {l}^{-} 1$. This is the weighted average of the individual isotopes, for example for $\text{palladium}$:
""^104Pd, (16.9%); ""^105Pd (29.3%); ""^106Pd (21.3%); ""^107Pd (17%); ""^108Pd (11.7%); and ""^110Pd (3.8%).