The statement which states both carbon-12 and carbon-13 have the same atomic mass is correct.
Statement a: They both have seven protons in the nucleus.
- It is incorrect because carbon-12 and carbon-13 have 6 protons.
Statement b: They both have the same mass number.
- It is incorrect because both don't have the same mass number. The mass number of carbon-12 is 12, whereas for carbon-13 it is 13.
Statement c: They both have seven neutrons in the nucleus.
- It is incorrect because carbon-12 has 6 neutrons whereas carbon-13 has 7 neutrons.
Statement d: They both have the same atomic number.
- It is considered as correct statement because the atomic number of carbon-12 and carbon-13 is the same which is 6.
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