* Isoelectronic means having the same number of electrons.

* Chlorine (Cl) has 17 electrons.

To find ions with 17 electrons, we need to consider:

* Anions: These are negatively charged ions formed by gaining electrons.

* Cations: These are positively charged ions formed by losing electrons.

Here are two ions that are isoelectronic with Cl:

* Argon (Ar): Argon is a noble gas with 18 protons and 18 electrons. Since it's neutral, it has the same number of electrons as Cl- (18).

* Sulfur (S)-2: Sulfur has 16 protons. To gain two electrons and become isoelectronic with Cl, it forms a -2 ion (S-2).

Therefore, the two ions isoelectronic with Cl are Ar and S-2.