Here's how to break it down:

* [Co(H₂O)₆]²⁺: This is the complex ion.

* Co²⁺: Cobalt(II) ion. The Roman numeral II indicates the cobalt ion has a +2 charge.

* (H₂O)₆: Six water molecules are coordinated to the cobalt(II) ion, acting as ligands.

* [ ]²⁺: The entire complex ion has a +2 charge to balance the +2 charge of the cobalt ion.

* Cl⁻: Chloride ion.

* [Co(H₂O)₆]Cl₂: The complete formula combines the complex ion and two chloride ions to achieve a neutral compound.