1. Element X has three isotopes. Abundances of these isotopes are given
below. What is the average atomic mass of X?
20X: 50% ; 21X: 25%; 19X: 25%
2 What is the average atomic mass of Mg, if the natural abundances of
Mg isotopes are given below?
24Mg: 78.70% 25Mg: 10.13% 23Mg: 11.17%
3. Find atomic masses of the following elements. Use Periodic table.
- sodium Na
- oxygen Os
- chlorine Cl
phosphorus P
- silver Ag
272
323
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