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The atomic weight of ruthenium to 3 digits after the dot is 101.065 unified Atomic Mass units.

The formula for calculating atomic weight is:

n

∑(wx*px)

x=1

where:

n is the number of isotopes you have the data for.

w is the weights of the isotopes.

p is the percent compositions of the isotopes in decimal form.

∑ is the summation symbol.

The data can be found in the provided link.

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