Phosphorus can indeed react with several elements to form stable compounds. Among the options you've provided:
1. **Phosphorous reacts with Lithium to form LiP** - This is not a common or well-known stable compound.
2. **Phosphorous is stable and will not react with other elements** - This is incorrect. Phosphorus can react with various elements.
3. **Phosphorous can react with Gallium to form a stable compound** - This statement is plausible. Phosphorus can react with gallium to form stable compounds like gallium phosphide (GaP).
4. **Phosphorous reacts with Bromine to form PBr2** - This is also correct. Phosphorus can react with bromine to form phosphorus dibromide (PBr2), which is a stable compound.
Among these options, both reactions with gallium and bromine can lead to the formation of stable compounds.