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

[Se(PMes₂)₂]

Formula Unicode styled: 
[Se(PMes₂)₂]
Compound name(s): 
bis-(dimesitylphosphorus)selenium
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(PPh₃)(AlCl₃)]

Formula Unicode styled: 
[Se(PPh₃)(AlCl₃)]
Compound name(s): 
(triphenylphosphane)-(trichloroaluminium)-selenium
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2X0L1Z1»
[MLXZ]𝘲 class: 
[ML1Z1]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(C₆H₂Buᵗ₃)₂(Ge(W(CO)₅})]

Formula Unicode styled: 
[Se(C₆H₂Buᵗ₃)₂(Ge(W(CO)₅})]
Compound name(s): 
bis-{(2,4,6-tri-t-butylphenyl)seleno}-(pentacarbonyl-tungsten)-germanium
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Mo(SeMes)₃]₂

Formula Unicode styled: 
[Mo(SeMes)₃]₂
Compound name(s): 
bis-[tris(2,4,6-trimethylphenylseleno)-molybdenum(Mo≡Mo)]
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[W(SeMes)₃]₂

Formula Unicode styled: 
[W(SeMes)₃]₂
Compound name(s): 
bis-[tris(2,4,6-trimethylphenylseleno)-tungsten(W≡W)]
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[V₂(μ₂-S)₂(μ₂-Se₂)(Cp*)₂]

Formula Unicode styled: 
[V₂(μ₂-S)₂(μ₂-Se₂)(Cp*)₂]
Compound name(s): 
bis(μ₂-sulfido)-(μ₂-diselenido)-bis(η⁵-pentamethyl-cyclopentadienyl)-di-vanadium
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2O-IE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(Ph){Bi(Ph)₂}]

Formula Unicode styled: 
[Se(Ph){Bi(Ph)₂}]
Compound name(s): 
phenylselenyl-diphenyl-bismuth
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Mo(O)(Se₄)₂]²⊖

Formula Unicode styled: 
[Mo(O)(Se₄)₂]²⊖
Compound name(s): 
bis(tetraselenido-Se,Se')-oxo-molybdenum(2-)
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2O-IE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se₂(C{NH(C₂H₂)₂NH})(μ₂-Te)]²⊕

Formula Unicode styled: 
[Se₂(C{NH(C₂H₂)₂NH})(μ₂-Te)]²⊕
Compound name(s): 
bis(selenourea-Se)-tellurium(2+)
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[{Se(C{NH(C₂H₂)₂NH})}(TeCl₂)]

Formula Unicode styled: 
[{Se(C{NH(C₂H₂)₂NH})}(TeCl₂)]
Compound name(s): 
cis-dichloro-bis(tetramethylselenourea-Se)-tellurium
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V4C2OIIE8B3L0X2Z1»
[MLXZ]𝘲 class: 
[MX2Z1]
MLXZ class (ENC, equivalent neutral class): 
MX2Z1

[Se(C₆H₄NO₂)]₂

Formula Unicode styled: 
[Se(C₆H₄NO₂)]₂
Compound name(s): 
bis-[(p-nitrophenyl)-selenium]
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[{Se(Ph)}₃(Sn)]⊖

Formula Unicode styled: 
[{Se(Ph)}₃(Sn)]⊖
Compound name(s): 
tris(phenylseleno)-tin(1-)
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se(SO₂Ph)]₂

Formula Unicode styled: 
[Se(SO₂Ph)]₂
Compound name(s): 
bis-[(p-phenylsulfonyl)-selanium]
Central atom: 
Attached groups: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Se₂(μ₂-C₆H₄){Zr(η⁵-C₅H₄Buᵗ)₂]

Formula Unicode styled: 
[Se₂(μ₂-C₆H₄){Zr(η⁵-C₅H₄Buᵗ)₂]
Compound name(s): 
phenylenediseleno-t-butyl-zirconocene
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

catena–2D-[{Se(Me)}₂(Hg)]

Formula Unicode styled: 
catena–2D-[{Se(Me)}₂(Hg)]
Compound name(s): 
catena-bis(μ₂-methyl-selenolato)-mercury
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V4C3OOE8B3L0X2Z1»
[MLXZ]𝘲 class: 
[MX2Z1]
MLXZ class (ENC, equivalent neutral class): 
MX2Z1

[Se{C(NH₂)₂}(HgMe)]⊕

Formula Unicode styled: 
[Se{C(NH₂)₂}(HgMe)]⊕
Compound name(s): 
selenourea-methyl-dimercury(1+)
Central atom: 
Charge on central atom: 
1
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V4C2OIIE8B3Z0L0X3»
[MLXZ]𝘲 class: 
[MX3]+
MLXZ class (ENC, equivalent neutral class): 
MX2Z1

[Se₂{(CH₂)₃}₂{W(CO)₄]

Formula Unicode styled: 
[Se₂{(CH₂)₃}₂{W(CO)₄]
Compound name(s): 
(1,5-diselenocyclo-octane)-(tetracarbonyl-tungsten)
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V4C3OIIE8B3L0X2Z1»
[MLXZ]𝘲 class: 
[MX2Z1]
MLXZ class (ENC, equivalent neutral class): 
MX2Z1

[Se(Ph){Au(PPh₃}]

Formula Unicode styled: 
[Se(Ph){Au(PPh₃}]
Compound name(s): 
bis-[(phenylselenato-triphenylphosphine-gold]
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2OOE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2

[Ge(Se)₂(μ₂-Se)]₂⁴⊖

Formula Unicode styled: 
[Ge(Se)₂(μ₂-Se)]₂⁴⊖
Compound name(s): 
bis-[diselenido-(μ₂-selenido)-germanium(2-)]
Central atom: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Ge«V4C4OIVE8B4Z0L0X4»
[MLXZ]𝘲 class: 
[MX4]
MLXZ class (ENC, equivalent neutral class): 
MX4

[Se{AsSe₂}]₃³⊖

Formula Unicode styled: 
[Se{AsSe₂}]₃³⊖
Compound name(s): 
cyclo-tris-[selenido-(μ₂-selenido)-arsenic(1-)]
Central atom: 
Attached groups: 
Charge on central atom: 
0
Compound type: 
Valence Number (VN) = 𝘹 + 2𝘻 : 
Oxidation Number (ON) (Roman numerals): 
Coordination Number (CN, sum of attached group denticities): 
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
Summary of calculated classifications: 
Se«V2C2O-IIE8B2Z0L0X2»
[MLXZ]𝘲 class: 
[MX2]
MLXZ class (ENC, equivalent neutral class): 
MX2