ICSE Class 10 Physics 2015 Solved Paper

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

Question : 73

Total: 74

The nucleus B emits a beta particle and is transformed into a nucleus C . What is the composition of nucleus C ?

Solution:

‌‌82208B

−β

────▸

‌83208C+e∘‌−1
No. of protons in C=83
No. of neutrons in C=208−83
=125

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