ICSE Class 10 Physics 2015 Solved Paper

An atomic nucleus $A$ is composed of 84 protons and 128 neutrons.

Question : 73 of 74

Marks: +1, -0

The nucleus

B

emits a beta particle and is transformed into a nucleus

C

. What is the composition of nucleus

C

Solution:

\;{ }_{82}^{208} {\B} \ { ──── ▸} ↖{-β}{ }_{83}^{208} {\C}+e^{∘}{ }_{-1}

No. of protons in

{\C}=83

No. of neutrons in

{\C}=208-83

=125

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