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  4. In a radioactive decay 92U238 xrightarrowα X xrightarrowα zYA The values of Z and A:

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Q. In a radioactive decay $ ^{92}{{U}_{238}}\xrightarrow{\alpha }X\xrightarrow{\alpha }z{{Y}^{A}} $ The values of Z and A:

MGIMS WardhaMGIMS Wardha 2003

Solution:

After emission of a-particle, the atomic number of new element is reduced by 2 unit and the atomic mass is reduced by 4 unit. Therefore, the new element after emission of $ \alpha - $ particle is $ _{90}{{X}^{234}} $ . Again by emission of one more $ \alpha - $ particle from $ _{90}{{X}^{234}} $ nucleus, new element is $ _{88}{{Y}^{230}} $ .