Question

If one electron is added to the outer shell of chlorine, it would have the same electron configuration as what element?

Answer 1

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

Answer 2

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:

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

• The above electronic configuration can be also written as:

                $[Cl]=[Ne]3s^23p^5$

• 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:

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

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

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

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.

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