An element Z contains two naturally occurring isotopes 17Z35 and 17Z37. If the average atomic mass is 35.5 u, then the percentage of two isotopes 17Z35 and 17Z37 repectively is:

An element Z contains two naturally occurring isotopes 17Z35... — Chemistry | Mockzy

MediumChemistryaverage atomic mass

+4 / -1

75%, 25%

25%, 75%

85%, 15%

15%, 85%

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