Which two elements are isotopes?
Correct answer: B. 14X8 and 15Y8
- A. 16X8 and 16Y8
- B. 14X8 and 15Y8
- C. 18X9 and 20Y10
- D. 12X6 and 12Y7
Explanation
In option A, both elements are the exact same, as they have same proton number (8) and same mass number (16) so, they are not isotopes (which vary in mass number but have the same proton number).Option B describes isotopes, as they have the same proton number (8), while having differing mass numbers.Option C describes two different elements entirely as they have varying proton numbers.Option D also describes two different elements due to varying proton numbers.
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