In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay?
A
proton.
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B
neutron.
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C
electron.
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D
photon.
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Solution
The correct option is D photon.
As the mass number and atomic number remains same, the mass and charge of nucleus remains same. So only thing emitted without any mass or charge is photon.