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ICSE Class 10 Physics 2020 Solved Paper

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An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an alpha particle and is transformed into a nucleus B.
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Question : 64
Total: 67
What is the composition of B ?
Solution:  
‌84A212
−α
────▸
‌82B208+‌2He4
∴B is composed of 82 protons and 126 (i.e., 208−82 ) neutrons.
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