EN: 23

[Np(CO₃-κ²O)₅]⁶⊖

Formula Unicode styled: 
[Np(CO₃-κ²O)₅]⁶⊖
Compound name(s): 
pentakis(carbonato-O,O')-neptunate
Central atom: 
Neptunium
Attached groups: 
CO₃ (carbonato-κ²O)
Charge on central atom: 
-6
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: 10
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 23
Summary of calculated classifications: 
Np«V4C10OIVE23B10Z0L0X10»6⊖
[MLXZ]𝘲 class: 
[MX10]6-
MLXZ class (ENC, equivalent neutral class): 
MX4L6