Is there any answer so I can answer it
A reaction in which oxidation numbers change is the answer! :D
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- No of protons=No of electrons=15
<h3>Mass no:-No of neutrons+No of protons </h3>

Now
- It has atomic no 15 hence its Phosphorus(P)
Electronic configuration:-
.
Chloride formula:-

or.

I tried to find them and I created a teacher account but you literally have to pay for them