4-coordinate: tetrahedral (p-block element, 2 lone pairs)

[Se(μ₂-SnMe₂)]₃

Formula Unicode styled: 
[Se(μ₂-SnMe₂)]₃
Compound name(s): 
cyclo-tris-[(dimethyl-tin)-selenium]
Central atom: 
Selenium
Attached groups: 
SnMe₂ (μ₂-dimethylstannene)
Charge on central atom: 
0
Compound type: 
Oligomer
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (-II)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(μ₂-CH₂)]₄

Formula Unicode styled: 
[Se(μ₂-CH₂)]₄
Compound name(s): 
1,3,5,7-tetraselenane
Central atom: 
Selenium
Attached groups: 
CH₂ (μ₂-methylidene)
Charge on central atom: 
0
Compound type: 
Oligomer
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (II)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(Se₂CNEt₂)₂]

Formula Unicode styled: 
[Se(Se₂CNEt₂)₂]
Compound name(s): 
bis(N,N-diethyldiselenocarbamato)selenium
Central atom: 
Selenium
Attached groups: 
Se₂CNEt₂ (diethyldiselenocarbamato-κSe)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (O)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se₂(CN)₂(μ₂-C₆H₄)]

Formula Unicode styled: 
[Se₂(CN)₂(μ₂-C₆H₄)]
Compound name(s): 
1,4-di-(cyano-seleno)benzene
Central atom: 
Selenium
Attached groups: 
CN (cyano-κC)
C₆H₄ (μ₂-phenyl-κC²)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(Se₂PEt₂-κS)₂]

Formula Unicode styled: 
[Se(Se₂PEt₂-κS)₂]
Compound name(s): 
bis(diethyldiselenophosphinato)-selenium
Central atom: 
Selenium
Attached groups: 
Se₂PEt₂ (diselenodiethylphosphinato-κSe)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(μ₂-CH₂)]₃

Formula Unicode styled: 
[Se(μ₂-CH₂)]₃
Compound name(s): 
1,3,5-triselenane
Central atom: 
Selenium
Attached groups: 
CH₂ (μ₂-methylidene)
Charge on central atom: 
0
Compound type: 
Oligomer
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (II)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(μ₂-C₂H₄)]₂

Formula Unicode styled: 
[Se(μ₂-C₂H₄)]₂
Compound name(s): 
1,4-diselenane
bis-[(μ₂-dimethylene)-selenium]
1,4-diselenan
Central atom: 
Selenium
Attached groups: 
C₂H₄ (μ₂-dimethylene)
Charge on central atom: 
0
Compound type: 
Oligomer
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (II)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Xe(OXe)₂]²⊕

Formula Unicode styled: 
[Xe(OXe)₂]²⊕
Compound name(s): 
dioxo-trixenon(2+)
Central atom: 
Xenon
Attached groups: 
OXe (xenoxo)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Xe«V4C2OIVE8B2Z0L0X2»2⊕
[MLXZ]𝘲 class: 
[MX2]2+
MLXZ class (ENC, equivalent neutral class): 
MZ2

[C(P{NMe₂}₂F}₂]

Formula Unicode styled: 
[C(P{NMe₂}₂F}₂]
Compound name(s): 
bis(bis(dimethylamino)fluoro)carbodiphosphorane
Central atom: 
Carbon
Attached groups: 
P(NMe₂)₂F (bis-(dimethylamino)fluorophosphane)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 0
Oxidation Number (ON) (Roman numerals): 
ON: (O)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
C«V0C2OOE8B2Z0X0L2»
[MLXZ]𝘲 class: 
[ML2]
MLXZ class (ENC, equivalent neutral class): 
ML2

[Se{Sm(THF)(Cp*)₂}₂]

Formula Unicode styled: 
[Se{Sm(THF)(Cp*)₂}₂]
Compound name(s): 
bis{bis(η⁵-pentamethyl-cyclopentadienyl)-tetrahydrofuran-samarium}-selenium
Central atom: 
Selenium
Attached groups: 
Sm group (X type)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(YbCp*₂)₂]

Formula Unicode styled: 
[Se(YbCp*₂)₂]
Compound name(s): 
bis(bis(η⁵-pentamethyl-cyclopentadienyl)-ytterbium)-selenium
Central atom: 
Selenium
Attached groups: 
Yb group (X type)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(SO₂Ph)₂]

Formula Unicode styled: 
[Se(SO₂Ph)₂]
Compound name(s): 
dibenzenesulfonyl-selenium
Central atom: 
Selenium
Attached groups: 
SO₂Ph (phenylsulfonyl)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Se«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[O(F)₂]

Formula Unicode styled: 
[O(F)₂]
Compound name(s): 
oxygen difluoride
difluoro-oxygen
Central atom: 
Oxygen
Attached groups: 
F (fluoro)
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: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
O«V2C2OIIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Cl(SnCl₂)₂]⊖

Formula Unicode styled: 
[Cl(SnCl₂)₂]⊖
Compound name(s): 
pentachloro-di-tin(1-)
Central atom: 
Chlorine
Attached groups: 
SnCl₂ (dichlorotin Z)
Charge on central atom: 
-1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (-I)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Cl«V3C2O-IE8B2L0X0Z2»⊖
[MLXZ]𝘲 class: 
[MZ2]-
MLXZ class (ENC, equivalent neutral class): 
MX1Z1

[C{C(NMe)CH=CH(NMe)}₂]

Formula Unicode styled: 
[C{C(NMe)CH=CH(NMe)}₂]
Compound name(s): 
2,2'-Methanediylidene-bis(1,3-dimethyl-2,3-dihydro-1H-benzimidazole)
Central atom: 
Carbon
Attached groups: 
C(NMe)CH=CH(NMe) (1,3-di-methylimidazol-2-ylidene)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 0
Oxidation Number (ON) (Roman numerals): 
ON: (O)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
C«V0C2OOE8B2Z0X0L2»
[MLXZ]𝘲 class: 
[ML2]
MLXZ class (ENC, equivalent neutral class): 
ML2

[P(Mes)₂]⊖

Formula Unicode styled: 
[P(Mes)₂]⊖
Compound name(s): 
dimestiylphosphorus(1-)
dimestiylphosphanide
Central atom: 
Phosphorus
Attached groups: 
Mes (mesityl)
Charge on central atom: 
-1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 1
Oxidation Number (ON) (Roman numerals): 
ON: (I)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
P«V1C2OIE8B2Z0L0X2»⊖
[MLXZ]𝘲 class: 
[MX2]-
MLXZ class (ENC, equivalent neutral class): 
MX1L1

[P(SiCl₃)₂]⊖

Formula Unicode styled: 
[P(SiCl₃)₂]⊖
Compound name(s): 
bis(trichlorosilyl)phosphide
bis(trichlorosilyl)phosphorus(1-)
Central atom: 
Phosphorus
Attached groups: 
SiCl₃ (trichlorosilyl)
Charge on central atom: 
-1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (-III)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
P«V3C2O-IIIE8B3L0X2Z1»⊖
[MLXZ]𝘲 class: 
[MX2Z1]-
MLXZ class (ENC, equivalent neutral class): 
MX3

[P{C₆H₃(CF₃)₂}(H)]⊖

Formula Unicode styled: 
[P{C₆H₃(CF₃)₂}(H)]⊖
Compound name(s): 
2,6-bis(trifluoromethyl)phenylphosphanide
2,6-bis(trifluoromethyl)phenylphosphorus(1-)
Central atom: 
Phosphorus
Attached groups: 
C₆H₃(CF₃)₂ (3,5-trifluoromethyl-phenyl)
H (hydrido)
Charge on central atom: 
-1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (I)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
P«V3C2OIE8B3L0X2Z1»⊖
[MLXZ]𝘲 class: 
[MX2Z1]-
MLXZ class (ENC, equivalent neutral class): 
MX3

[P(C₆H₂Buᵗ₃)(=CHPh)]

Formula Unicode styled: 
[P(C₆H₂Buᵗ₃)(=CHPh)]
Compound name(s): 
2,4,6-tri-t-Butyl-phenyl-(phenylmethylene)-phosphane
Central atom: 
Phosphorus
Attached groups: 
C₆H₂Buᵗ₃ (2,4,6-tri-t-butylphenyl)
=CHPh (benzylidene)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (III)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
P«V3C2OIIIE8B3Z0L0X3»
[MLXZ]𝘲 class: 
[MX3]
MLXZ class (ENC, equivalent neutral class): 
MX3

[P(CN)₂]⊖

Formula Unicode styled: 
[P(CN)₂]⊖
Compound name(s): 
dicyanophosphorus(1-)
Central atom: 
Phosphorus
Attached groups: 
CN (cyano-κC)
Charge on central atom: 
-1
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (I)
Coordination Number (CN, sum of attached group denticities): 
CN: 2
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
P«V3C2OIE8B3L0X2Z1»⊖
[MLXZ]𝘲 class: 
[MX2Z1]-
MLXZ class (ENC, equivalent neutral class): 
MX3