What the name of NaClO4?

It is an ionic substance called Sodium Hyphoclorite. Sodium Hypochlorite is an alkaline, corrosive, light yellow solution. It is formed when caustic soda (NaOH) and chlorine (Cl2) react. It is widely used for its bleaching, disinfecting and oxidizing properties. Sodium Hypochlorite shows, as well as chlorine, a very high reactivity and oxidizing power, but as a solution it is much easier to handle than chlorine.