An atom of carbon has 6 protons. Its mass number is 1 2. How many neutrons are present in an atom of carbon ?

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Q: 22 (NDA-I/2016)
An atom of carbon has 6 protons. Its mass number is 1
2. How many neutrons are present in an atom of carbon ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,43,11,10,43,1,0

keywords: 

{'many neutrons': [0, 0, 0, 1], 'carbon': [1, 0, 4, 5], 'mass number': [0, 0, 0, 3], 'protons': [0, 0, 0, 1], 'atom': [0, 0, 0, 2]}