ICSE Class 10 Physics 2020 Paper

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 $B$ .

Question : 64 of 67

Marks: +1, -0

What is the composition of

B

Solution:

{}_{84}\mathrm{A}^{212}\xrightarrow{-\alpha}{}_{82}\mathrm{B}^{208}+{}_{2}\mathrm{He}^{4}

\therefore B

is composed of 82 protons and 126 (i.e.,

208-82

) neutrons.

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