Answer:
[tex]_{19}^{42}K --> _{20}^{42}Ca + \beta + \nu[/tex]
Explanation:
In Beta decay unstable nuclei will convert into stable nuclei by converting its neutron into an electron and a proton.
this process is given as
[tex]n --> p + \beta + \nu[/tex]
so in this process mass number will remain same but atomic number will increased by 1
So the new nuclei is of higher atomic number
So we will have
[tex]_{19}^{42}K --> _{20}^{42}Ca + \beta + \nu[/tex]
so above is the nuclear reaction
