C≡CR (alkynyl)

[Hf(C≡CSiBuᵗ₃)₆]²⊖

Formula Unicode styled: 
[Hf(C≡CSiBuᵗ₃)₆]²⊖
Compound name(s): 
hexakis(tri-t-butylsilylacetylene)-hafnium(2-)
Central atom: 
Silicon
Attached groups: 
C≡CR (alkynyl)
Buᵗ (t-butyl)
Charge on central atom: 
0
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: 4
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Si«V4C4OIVE8B4Z0L0X4»
[MLXZ]𝘲 class: 
[MX4]
MLXZ class (ENC, equivalent neutral class): 
MX4

[Ta(C≡CSiBuᵗ₃)₆]⊖

Formula Unicode styled: 
[Ta(C≡CSiBuᵗ₃)₆]⊖
Compound name(s): 
hexakis(tri-t-butylsilylalkynyl)-tantalum(1-)
Central atom: 
Silicon
Attached groups: 
C≡CR (alkynyl)
Buᵗ (t-butyl)
Charge on central atom: 
0
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: 4
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 8
Summary of calculated classifications: 
Si«V4C4OIVE8B4Z0L0X4»
[MLXZ]𝘲 class: 
[MX4]
MLXZ class (ENC, equivalent neutral class): 
MX4