Which pair of neutrons and protons correspond to the isobar of N and C which have a mass number of 14?

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N: 7 protons and 7 neutrons ; C: 6 protons and 8 neutrons

N: 6 protons and 8 neutrons ; C: 6 protons and 8 neutrons

N: 7 protons and 7 neutrons ; C: 8 protons and 6 neutrons

N: 6 protons and 8 neutrons ; C: 8 protons and 6 neutrons

answer is A.

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Detailed Solution

Isobars have same mass number and different atomic number.
Atomic number of carbon is 6 and that of nitrogen is 7, so carbon will have 6 protons and nitrogen will have 7 protons.
Mass number is the sum of number of protons and neutrons.
Mass number of both elements is 14, so carbon should have 14-6 = 8 neutrons and nitrogen should have 14-7 = 7 neutrons.
So the correct pair of protons and neutrons to correspond to the isobar of nitrogen and carbon will be N: 7 protons and 7 neutrons; C: 6 protons and 8 neutrons.

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