Why carbon-12 is an isotope of carbon?

Answer 1

Because elemental carbon has several isotopes. All carbon nuclei possess 6 protons, but some carbon nuclei possess more than 6 neutrons.

All carbon nuclei have the same atomic number, #Z#, the number of protons in the nucleus. For #C, Z = 6#, i.e. there are 6 protons in the carbon nucleus. If there were not 6 protons in the nucleus, the element would not be #C#. Most carbon nuclei have 6 neutrons; however, there are a very small percentage that have 7 or 8 neutrons, or even more neutrons. Approx. 99% of all carbon nuclei are carbon-12. It is the number of protons that determine the atomic number, that is the element's identity.

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Answer 2

Olivia Anton

With the same number of protons as carbon-14 and carbon-13 but a different number of neutrons, resulting in a different atomic mass, carbon-12 is an isotope of carbon.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.