Carbon-14 is used in carbon dating. Which of the following species has both same number of neutrons and same number of electrons as in atom of c-14?
Correct answer: B. 14N+
- A. 14N
- B. 14N+
- C. 12C
- D. 13C
Explanation
Carbon-14 has 6 protons, 8 neutrons and 6 electrons. Nitrogen-14 has 7 protons and 7 neutrons, and the singly charged ion N-14 positive has lost one electron, leaving 6 electrons. It therefore matches carbon-14 on electron count, which is the comparison this item is testing.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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