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Q.

The nucleus B (with 84 protons and 126 neutrons) emits a β particle and is transformed into a nucleus C. What is the composition of C?



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a

83 protons and 125 neutrons

b

85 protons and 125 neutrons

c

84 protons and 125 neutrons

d

83 protons and 126 neutrons 

answer is B.

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Detailed Solution

Concept: According to the question, the nucleus changes to nucleus C by emitting a particle, which
causes neutrons to be converted into protons.
 So, one proton increases and one neutron decreases in the nucleus to form the new nucleus C.
So the number of protons in the nucleus of C is now 84+1 = 85.
Alternatively, the number of neutrons becomes 126-1 = 125 neutrons.
As a result, 85 protons and 125 neutrons provide the correct answer.
Hence, option 2 is correct.
 
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