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An element (E) has several naturally occurring isotopes, with the following abundances: 72E, 54.5% 73E, 15.6%...

An element (E) has several naturally occurring isotopes, with the following abundances:
72E, 54.5% 73E, 15.6% 74E, 29.9%

1.72.1

2.72.8

3.73.4

4.73.8

5.74.0

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