8-coordinate: hexagonal bipyramid (HBPY-8)

trans–[Np{(O)₂}(CO₃-κ²O)₃]⁴⊖

Formula Unicode styled: 
trans–[Np{(O)₂}(CO₃-κ²O)₃]⁴⊖
Compound name(s): 
tricarbonatodioxoneptunate(VI)
Central atom: 
Neptunium
Attached groups: 
(O)₂ (di{oxo ⭀O X₂L} trans Ⓢ)
CO₃ (carbonato-κ²O)
Charge on central atom: 
-4
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 6
Oxidation Number (ON) (Roman numerals): 
ON: (VI)
Coordination Number (CN, sum of attached group denticities): 
CN: 8
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 25
Summary of calculated classifications: 
Np«V6C8OVIE25B12Z0X10L2»4⊖
[MLXZ]𝘲 class: 
[MX10L2]4-
MLXZ class (ENC, equivalent neutral class): 
MX6L6

trans–[Np{(O)₂}(OPPh₃)₂(O₂NO-κ²O)₂]

Formula Unicode styled: 
trans–[Np{(O)₂}(OPPh₃)₂(O₂NO-κ²O)₂]
Compound name(s): 
Dinitrato-dioxo-bis(triphenylphosphine-oxide)-neptunium
Central atom: 
Neptunium
Attached groups: 
(O)₂ (di{oxo ⭀O X₂L} trans Ⓢ)
OPPh₃ (triphenylphosphane oxide)
NO₃ (nitrato-κ²O)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 6
Oxidation Number (ON) (Roman numerals): 
ON: (VI)
Coordination Number (CN, sum of attached group denticities): 
CN: 8
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 25
Summary of calculated classifications: 
Np«V6C8OVIE25B12Z0X6L6»
[MLXZ]𝘲 class: 
[MX6L6]
MLXZ class (ENC, equivalent neutral class): 
MX6L6

trans–[Np{(O)₂}(OH₂)₂(O₂CEt)₂]

Formula Unicode styled: 
trans–[Np{(O)₂}(OH₂)₂(O₂CEt)₂]
Compound name(s): 
Diaqua-dioxo-bis(propanoato)-neptunium(VI)
Central atom: 
Neptunium
Attached groups: 
(O)₂ (di{oxo ⭀O X₂L} trans Ⓢ)
OH₂ (aqua)
O₂CEt (propanoato-κ²O)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 6
Oxidation Number (ON) (Roman numerals): 
ON: (VI)
Coordination Number (CN, sum of attached group denticities): 
CN: 8
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 25
Summary of calculated classifications: 
Np«V6C8OVIE25B12Z0X6L6»
[MLXZ]𝘲 class: 
[MX6L6]
MLXZ class (ENC, equivalent neutral class): 
MX6L6

trans–[Np{(O)₂}(18-crown-6-κ⁶O)]⊕

Formula Unicode styled: 
trans–[Np{(O)₂}(18-crown-6-κ⁶O)]⊕
Compound name(s): 
Dioxo-(18-crown-6)-neptunium(v)
Central atom: 
Neptunium
Attached groups: 
(O)₂ (di{oxo ⭀O X₂L} trans Ⓢ)
18-crown-6 (18-crown-6-κ⁶O)
Charge on central atom: 
1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 5
Oxidation Number (ON) (Roman numerals): 
ON: (V)
Coordination Number (CN, sum of attached group denticities): 
CN: 8
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 26
Summary of calculated classifications: 
Np«V5C8OVE26B12Z0X4L8»⊕
[MLXZ]𝘲 class: 
[MX4L8]+
MLXZ class (ENC, equivalent neutral class): 
MX5L7