The reaction is:
Cr₃⁺ +3 C₁₀H₈N₂ → [Cr(C₁₀H₈N₂)₃]³⁺
2,2\'-bipyridine is bidentate ligand and neutral. It exhibits two N terminal, thus, it functions as bidentate ligand.
Therefore, three 2,2\'-bipyridine ligand fulfills the six coordination number of Cr₃⁺.
The formula for the complex is [Cr(C₁₀H₈N₂)₃]³⁺
For example, silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28.
The element fluorine (F) is the most reactive nonmetal.
C, Electronegativity Increases