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

1 Answer
anor277
Nov 25, 2016

#"The atomic mass......."#

Explanation:

The weighted average of an individual element's isotopes is the atomic mass quoted on the Periodic Table.

The quoted atomic mass for palladium metal is #106.42*g*mol^-1#. This is the weighted average of the individual isotopes, for example for #"palladium"#:

#""^104Pd, (16.9%); ""^105Pd (29.3%); ""^106Pd (21.3%); ""^107Pd (17%); ""^108Pd (11.7%); and ""^110Pd (3.8%).#

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