A radioactive element ${}_{92}^{242}X$ emits two $α - particles$ , one electron and two positrons. The product nucleus is represented by ${}_{P}^{234}Y$ . The value of $P$ is _______

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answer is 87.

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Detailed Solution

For each $α$ - particle mass no. decreases by 4 & charge no. decrease by 2
For each e^- charge no. increases by 1.
For each e⁺ charge no. decreases by 1.

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