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  4. A thorium nucleus is formed, when a uranium nucleus emits an α-particle. Atomic number of thorium is

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Q. A thorium nucleus is formed, when a uranium nucleus emits an $\alpha$-particle. Atomic number of thorium is

KCETKCET 1997Atoms

Solution:

Emission of $\alpha$-particle reduces the atomic number of the emitted by 2. Atomic number of thorium is 90 (atomic number of uranium is 92).