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The elements radium and astatine both arise during the radioactive decay of uranium. They get together...

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Chemistry

The elements radium and astatine both arise during theradioactive decay of uranium. They get together in the form of thesalt RaAt2; the radius of the Ra2+ ion is 162 pm and the radius ofthe At- ion is 226 pm. (a) Predict the coordination number of Raand At as well as the type of lattice that RaAt2 will adopt. (b)Calculate the lattice energy of RaAt2.

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