No, Ca²⁺ does not have the same number of electrons as argon. Here's why:

* Calcium (Ca): Calcium has 20 electrons in its neutral state.

* Ca²⁺: When calcium loses two electrons to become a cation (Ca²⁺), it now has only 18 electrons.

* Argon (Ar): Argon is a noble gas with 18 electrons.

Therefore, Ca²⁺ has the same number of electrons as argon.