Answer:- [tex]1s^22s^22p^63s^23p^6[/tex]
Explanations:- Atomic number of chlrone(Cl) is 17 it means it has 17 electrons. It's electron configuration is: [tex]1s^22s^22p^63s^23p^5[/tex] .
Chloride ion is formed when Cl accepts one electron:
[tex]Cl+e^-\rightarrow Cl^-[/tex]
So, electrons for the chloride ion = 17+1 = 18
If we look at the electron configuration of Cl then 3p is still vacant as there are 5 electrons in it and it could have maximum 6 electrons. So, this 18th electron goes to 3p and the electron configuration of chloride ion becomes:
[tex]1s^22s^22p^63s^23p^6[/tex] .
