[Jayyouellwhyee]

The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance atomic masses are 69.2% for mass=62.9 amu, and 30.8% for mass= 64.93 amu. Calculate the average atomic mass of cooper.

[Unknown008]

The relative atomic mass of copper here, is the weighted average of each isotope.

For example, Take Bromine. There are two isotopes of Bromine, namely Br-79 and Br-81, each being of 50% abundance.

The relative atomic mass of bromine is therefore given by:



Can you try this for copper now?

[mannie72896]

Describe the relationship between atomic radii and atomic number for the group A elements in the first four periods.

If you can answer this thank you!