This element can be produced via fusion of two carbon atoms at 600 megakelvins in a star  with at least three solar masses, or in a Downs Cell or by electrolysis in the Castner process.  Vapor lamps made of this element are used for street lighting and give off a distinctive yellow  light, and it was discovered through electrolysis by Humphry Davy. This soft, silvery metal
This element can be produced via fusion of two carbon atoms at 600 megakelvins in a star  with at least three solar masses, or in a Downs Cell or by electrolysis in the Castner process.  Vapor lamps made of this element are used for street lighting and give off a distinctive yellow  light, and it was discovered through electrolysis by Humphry Davy. This soft, silvery metal is  exchanged with potassium in a namesake pump. For 10 points, identify this element with atomic  number 11, which forms a common condiment with chloride.
This element can be produced via fusion of two carbon atoms at 600 megakelvins in a star  with at least three solar masses, or in a Downs Cell or by electrolysis in the Castner process.  
sodium or Na