Nigerian Scholars » Past Questions » Physics » How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79} \mathrm{Au} \leftarrow ^{198}_{80} \mathrm{Hg}\)...

How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79} \mathrm{Au} \leftarrow ^{198}_{80} \mathrm{Hg}\)...


Question

How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79} \mathrm{Au} \leftarrow ^{198}_{80} \mathrm{Hg}\)?

Options

A) 1

B) 2

C) 3

D) 5

The correct answer is A.

Explanation:

A beta particle forms when a neutron changes into a proton and a high-energy electron. The proton stays in the nucleus but the electron leaves the atom as a beta particle. When a nucleus emits a beta particle, these changes happen:

  • the mass number stays the same
  • the atomic number increases by 1
  • the nuclear charge increases by 1

NB: Usually gold is created from platinum, which has one less proton than gold, or from mercury, which has one more proton than gold. Bombarding a platinum or mercury nucleus with neutrons can knock off an neutron or add on a neutron, which through natural radioactive decay can lead to gold.


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Discussion (5)

  • A beta particle forms when a neutron changes into a proton and a high-energy electron. The proton stays in the nucleus but the electron leaves the atom as a beta particle. When a nucleus emits a beta particle, these changes happen:

    • the mass number stays the same
    • the atomic number increases by 1
    • the nuclear charge increases by 1

    NB: Usually gold is created from platinum, which has one less proton than gold, or from mercury, which has one more proton than gold. Bombarding a platinum or mercury nucleus with neutrons can knock off an neutron or add on a neutron, which through natural radioactive decay can lead to gold.

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  • Clinton Godswill

    Pls enlighten me better, i don't get it

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  • Clinton Godswill

    Pls enlighten me better, i don't get it

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  • Because bata particles emit -1 and this is just balancing equation.

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  • Miranda

    This is because beta particles emit -1 and 0

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