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⁹²U²³⁵ nucleus absorbs a neutron and disintegrates into ⁵⁴Xe¹³⁹, ³⁸Sr⁹⁴ and x. So what will be the product x?

1. 3-neutrons
2. 2-neutrons
3. α-particle
4. β-particle

Correct answer: 3-neutrons

Solution

The total mass number and atomic number must be conserved. The sum of mass numbers of ⁵⁴Xe¹³⁹ (139), ³⁸Sr⁹⁴ (94), and x must equal 236 (235 + 1 neutron). Similarly, the sum of atomic numbers must equal 92. This conservation confirms x is 3 neutrons.

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