What are the ligands?

Six neutral NH3 molecules donating lone pairs from N

What happens to the three Cl- outside the bracket?

They ionise and precipitate with AgNO3

Short answer

Complex ion: [Co(NH₃)₆]³⁺ (hexaamminecobalt(III) ion). Ligands: six neutral NH₃ molecules; coordination number 6. Counter ions: three Cl⁻.

Identify the complex ion and ligands in the compound [Co(NH₃)₆]Cl₃.

In [Co(NH₃)₆]Cl₃:

Complex ion: [Co(NH₃)₆]³⁺ (hexaamminecobalt(III) ion), the part inside the square bracket.
Ligands: six neutral ammonia (NH₃) molecules, each donating a lone pair on N to Co³⁺.
Central metal ion: Co³⁺; coordination number 6.
Counter ions: three Cl⁻ outside the bracket, which ionise and precipitate with AgNO₃.

✓ Answer checked by Claude Opus 5.5 (high effort)