Atom
Name
Silicon
IUPAC name
Silicon
InChI
InChI=1S/Si
InChI key
XUIMIQQOPSSXEZ-UHFFFAOYSA-N
CAS number
7440-21-3
Comments
natural Si - 92.2% 28Si + 4.7% 29Si +3.1% 30Si
Symbol and fundamental properties
Symbol
Si
Formula
Si
Charge
0
Atomic number Z
14
Molar mass
28.0855 g/mol
State STP
solid
Electronegativity
1.9
Isotope mixture type
terrestrial abundance
Isotopes
  IUPAC Name A Mole fraction
Silicon-28 28 0.92223
Silicon-29 29 0.04685
Silicon-30 30 0.03092
Type K L1 L2 L3
Energy (keV) 1.8389 0.1487 0.0992 0.0992