Relative atomic mass and relative formula mass

Explain that atomic masses are measured relative to one twelfth of a carbon-12 atom, and calculate the relative formula mass Mr of a compound, including hydrated salts, by adding relative atomic masses Ar from the data booklet.

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(i) State the number of protons, electrons and neutrons in $\ce{^{85}Rb+}$ . (ii) State the full electron configuration for $\ce{^{85}Rb+}$ . (iii) The relative atomic mass, $A_r$ , of Rb is 85.47. Isotope Mass Percent abundance $\ce{^{x}Rb}$ 72.17 %…

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