A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Easy

Analysis of a copper-bearing mineral sample collected from a deep-sea hydrothermal vent reveals an unusual isotopic distribution of copper.

The sample contains only two isotopes of copper, $63Cu^{63}\text{Cu}$ and $65Cu^{65}\text{Cu}$ .

The table below shows the mass numbers and percentage abundances of these two isotopes in the hydrothermal vent sample.

Isotope	Mass number	Percentage abundance (%)
$63Cu^{63}\text{Cu}$	63	68.7
$65Cu^{65}\text{Cu}$	65	31.3

Calculate the relative atomic mass ( $A_r$ ) of copper in this sample.

Give your answer to 1 decimal place.

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A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions