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Q.

Which of the following elements of isotopes has the atomic number of 6 and the mass number of 12?


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a

Uranium

b

Carbon

c

Potassium

d

None of the above 

answer is B.

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Detailed Solution

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Carbon element has an isotope which contains the atomic number 6 and mass number 12. Its symbol is C612.
Isotopes exist for several elements, including carbon, potassium, and uranium. Uranium has an atomic number of 92 and a mass number of 238 for its isotope. Six protons, six neutrons, and six electrons make up a neutral carbon-12 atom, giving it a mass number of 12. There are 19 atomic numbers and 39 mass numbers for potassium. Hence, carbon has 6 atomic numbers and 12 mass numbers.
 
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