Respuesta :

Assuming we had ground state (stable) Cl, adding 1 electron would make it isoelectronic with Argon

If one electron is added to the outer shell of chlorine it would have the same electron configuration as argon.

Explanation:

  • The chlorine has an atomic number of 17 and is present in the third period under group 17.
  • The electronic configuration of the chlorine atom is written as:

                [tex][Cl]=1s^22s^22p^63s^23p^5[/tex]

  • The above electronic configuration can be also written as:

                [tex][Cl]=[Ne]3s^23p^5[/tex]

  • In order to attain noble gas configuration chlorine will gain one electron to attain a stable electronic configuration of a noble gas present in the respective period.
  • The electronic configuration of a chloride ion will be:

                [tex][Cl^-]=1s^22s^22p^63s^23p^6[/tex]

  • The noble gas period 3 is argon and its electronic configuration is:

                  [tex][Ar]=1s^22s^22p^63s^23p^6[/tex]

So, from this, we can conclude that If one electron is added to the outer shell of chlorine it would have the same electron configuration as argon.

Learn more electronic configuration here:

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