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Uranium-238 undergoes radioactive decay according to the incomplete below. 238

92
U= 4
2 He + X.
What is the decay product represented by X?

Uranium-238 undergoes radioactive decay according to the incomplete below. 238 92 U-example-1

1 Answer

6 votes

The decay product represented by X : Thorium (Th) : ²³⁴₉₀Th

Further explanation

Given

Decay reaction

²³⁸₉₂U ⇒ ⁴₂He + X

Required

The decay product

Solution

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,

  • alpha α particles ₂He⁴
  • beta β ₋₁e⁰ particles
  • gamma particles ₀γ⁰
  • positron particles ₁e⁰
  • neutron ₀n¹

In a decay reaction, the sum of the mass number and atomic number of the elements in the reactants and products must be the same

So the mass number of the element X = 238 - 4 = 234

Atomic number of the element X = 92 - 2 = 90

If we look at the periodic system, then the element with atomic number 90 is Thorium (Th)

User Noel Ang
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