name the following complex ions:

[Cu(OH)4]^2-
[Ni(NH2CH2CH2NH2)]^2+
[Co(SCN)4]2-

http://www.chemguide.co.uk/inorganic/complexions/names.html

http://www.chemistry.wustl.edu/~edudev/LabTutorials/naming_coord_comp.html

The names of the complex ions you provided are as follows:

[Cu(OH)4]^2- : Tetrahydroxocuprate(II)

[Ni(NH2CH2CH2NH2)]^2+ : Bis(ethylenediamine)nickel(II)

[Co(SCN)4]2- : Tetrathiocyanatocobaltate(II)

To name complex ions, we need to identify the central metal atom/ion and the surrounding ligands. Here's how to name the given complex ions:

1. [Cu(OH)4]^2-
- The central metal ion is Cu, which represents copper.
- The ligands are hydroxide ions (OH-).
- The name of this complex ion is copper(II) tetrahydroxide.

2. [Ni(NH2CH2CH2NH2)]^2+
- The central metal ion is Ni, which represents nickel.
- The ligand is a bidentate ligand known as ethylenediamine, represented by NH2CH2CH2NH2.
- The name of this complex ion is nickel(II) ethylenediamine.

3. [Co(SCN)4]2-
- The central metal ion is Co, which represents cobalt.
- The ligand is thiocyanate ion (SCN-).
- The name of this complex ion is cobalt(II) thiocyanate.