SiF4 is the chemical formula of silicon tetrafluoride.
This compound is silicon dioxide - SiO2.The oxide SiO is not yet accepted.
The compound Na4Si is called sodium silicide. It is a binary compound composed of sodium (Na) and silicon (Si).
Silane has the chemical formula SiH4; but silane has covalent bonds.
Neither, because silicon is an element, not a compound.
If you think to silicon nitride, Si3N4, this is a chemical compound with covalent bonds.
Silicon (Si) and Oxygen (O)
Si Robertson's birth name is Silas Robertson.
Si Rose's birth name is Sy Rose.
Si Zentner's birth name is Simon Zentner.
Si Newhouse's birth name is Simeon Newhouse.
Si Frumkin's birth name is Simas Frumkinas.
Si Jenks's birth name is Jenkins, Howard.