Element 88 Radium
Radium is a chemical with the symbol named Ra and atomic number 88. it is the sixth element in group 2 of the periodic table, also known as alkaline earth metals. Pure radium is almost colorless but readily combines with nitrogen on exposure to air, forming a black surface layer. All isotopes of radium are actively radioactive, with the most stable isotope begin radium-226, which has a half life of 1600 years and decays on radon gas. When radium decays , ionizing radiation is a product, which can excite fluorescent chemicals and cause radioluminescence.