In which radioactive disintegration does the neutron dissociate into proton and electron?

$H e^{+ +} - e m i s s i o n$

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$β - e m i s s i o n$

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$γ - e m i s s i o n$

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$p o s i t r o n e m i s s i o n$

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Solution

The correct option is B
$β - e m i s s i o n$

In $β$ - decay, a neutron dissociates into proton and electron.

Since in beta minus a neutron converts into a proton so the atomic number has to increase by 1.
Will the mass number change??
Hmmm...
Not exactly right.
Now I have a neutron less but a proton more, so the mass number is gonna remain unchanged.

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