Se₆ (hexaseleno-κ²Se)

[Sn(Se₄)(Se₆)₂]²⊖

Formula Unicode styled: 
[Sn(Se₄)(Se₆)₂]²⊖
Compound name(s): 
bis(hexaselenido)-(tetraselenido)-tin(2-)
Central atom: 
Tin
Attached groups: 
Se₄ (tetraseleno-κ²Se)
Se₆ (hexaseleno-κ²Se)
Charge on central atom: 
-2
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 4
Oxidation Number (ON) (Roman numerals): 
ON: (IV)
Coordination Number (CN, sum of attached group denticities): 
CN: 6
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 12
Summary of calculated classifications: 
Sn«V4C6OIVE12B6Z0L0X6»2⊖
[MLXZ]𝘲 class: 
[MX6]2-
MLXZ class (ENC, equivalent neutral class): 
MX4L2