Si2Se4 (2 and 4 on bottom below)
P4Se3 is the chemical formula for the molecule tetraphosphorus triselenide.
The name of this chemical compound is tetraphosphorus heptasulfide.
The formula for tetraphosphorus octahydride is P4H8.
The formula name for P4S5 is tetraphosphorus pentasulfide.
The chemical formula for tetraphosphorus pentoxide is P4O10.
P4Se3 is the chemical formula for the molecule tetraphosphorus triselenide.
The name of this chemical compound is tetraphosphorus heptasulfide.
The formula for tetraphosphorus octahydride is P4H8.
P4Se3
The formula name for P4S5 is tetraphosphorus pentasulfide.
The chemical formula for tetraphosphorus pentoxide is P4O10.
The compound is tetraphosphorus trisulfide.
The prefex tetra is greek for 4 and the prefix tri is greek for 3. Therefor the formula for tetraphosphorus trisulfide is P4S3
The molecular formula for tetraphosphorus decasulfide is P4S10. It consists of four phosphorus atoms bonded with ten sulfur atoms in a linear chain structure.
Phosphorous Trioxide
P4O10 - P for Phosphorous, 4 for tetra; O for oxygen, 10 for dec-.
This compound is hypothetical and is not possible it is P4O10