Se₄ (μ₂-tetraseleno-κ³Se)

fac–[Re(μ₂-Se₄-κ³Se)(CO)₃]₂²⊖

Formula Unicode styled: 
fac–[Re(μ₂-Se₄-κ³Se)(CO)₃]₂²⊖
Compound name(s): 
bis-[(μ₂-tetraselenide-Se,Se,Se')-tricarbonyl-rhenium(1-)]
Central atom: 
Rhenium
Attached groups: 
Se₄ (μ₂-tetraseleno-κ³Se)
CO (carbonyl)
Charge on central atom: 
-1
Compound type: 
Oligomer
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 1
Oxidation Number (ON) (Roman numerals): 
ON: (I)
Coordination Number (CN, sum of attached group denticities): 
CN: 6
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 18
Summary of calculated classifications: 
Re«V1C6OIE18B6Z0X2L4»⊖
[MLXZ]𝘲 class: 
[MX2L4]-
MLXZ class (ENC, equivalent neutral class): 
MX1L5