what are two standard elements
All chemical substances are either solid, liquid or gas. The standard state of a chemical substance is its phase (solid, liquid, gas) at 25.0 Â°C and one atmosphere pressure. Two elements are liquid in their standard state: mercury and bromine. Eleven elements are gas in their standard state. All of the noble gases (He, Ne, Ar, Kr, Xe, Rn) as well the halogens flourine and chlorine. Hydrogen, oxygen and nitrogen are the others. All other elements are solid in their standard state.