The model of the nuclear atom was first proposed by Ernest Rutherford. He developed this model on the basis of results obtained from an experiment using gold metal foil.

1. (a)Complete the table with information for two of the particles in an atom of 197Au. particle relative mass relative charge location within atom total number in an atom of 197Au electron 0.0005 -1 neutron 79 nucleus[4]
2. (b)State the type of bonding in gold.[1]
3. (c)(i)Explain what is meant by the term isotopes.[2]
4. (c)(ii)A different sample of gold contains more than one isotope. Suggest why this different sample of gold has the same chemical properties as the sample found in the earth.[1]
5. (d)(i)Tumbaga is an alloy of copper and gold. A sample of tumbaga was analysed. The mass spectrum of the sample is shown. [Figure showing mass spectrum with peaks at m/e 63, 65, 197 and percentage abundances 56.36, 25.14, x respectively] Calculate the percentage abundance of gold, x, in the sample of tumbaga. x = ................................... %[1]
6. (d)(ii)Calculate the relative atomic mass, Ar, of the copper present in this sample. Give your answer to two decimal places. Ar (Cu) = ...................................[2]

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