=C(CH₂CH₂CH₂CH₂) (cyclopentylidene)

[O{=C(CH₂CH₂CH₂CH₂)}]

Formula Unicode styled: 
[O{=C(CH₂CH₂CH₂CH₂)}]
Compound name(s): 
Cyclopentanone
Central atom: 
Oxygen
Attached groups: 
=C(CH₂CH₂CH₂CH₂) (cyclopentylidene)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (-II)
Coordination Number (CN, sum of attached group denticities): 
CN: 1
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
O«V2C1O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Re{=C(CH₂CH₂CH₂CH₂)}(PPh₃)(NO)(Cp)]⊕

Formula Unicode styled: 
[Re{=C(CH₂CH₂CH₂CH₂)}(PPh₃)(NO)(Cp)]⊕
Compound name(s): 
(η⁵-Cyclopentadienyl)-(cyclopentadiylidene)-nitrosyl-triphenylphosphine-rhenium(1+)
Central atom: 
Rhenium
Attached groups: 
=C(CH₂CH₂CH₂CH₂) (cyclopentylidene)
PPh₃ (triphenylphosphane)
NO (nitrosyl, linear)
Cp (η⁵-cyclopentadienyl)
Charge on central atom: 
1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 7
Oxidation Number (ON) (Roman numerals): 
ON: (III)
Coordination Number (CN, sum of attached group denticities): 
CN: 6
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 18
Summary of calculated classifications: 
Re«V7C6OIIIE18B9X4L4Z1»⊕
[MLXZ]𝘲 class: 
[MX4L4Z1]+
MLXZ class (ENC, equivalent neutral class): 
MX7L2