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Radium is a chemical element with symbol Ra and atomic number 88.It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals.

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Crystallization from aqueous solution gives the dihydrate Ra Cl O, isomorphous with its barium analog.They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later.Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne through the electrolysis of radium chloride in 1911.Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra).All isotopes of radium are highly radioactive, with the most stable isotope being radium-226, which has a half-life of 1600 years and decays into radon gas (specifically the isotope radon-222).More specifically, natural radium (which is mostly All isotopes of radium have half-lives much shorter than the age of the Earth, so that any primordial radium would have decayed long ago.

Radium nevertheless still occurs in the environment, as the isotopes Thus, radium is found in tiny quantities in the uranium ore uraninite and various other uranium minerals, and in even tinier quantities in thorium minerals.

The ionizing radiation emitted by radium bromide excites nitrogen molecules in the air, making it glow.

The alpha particles emitted by radium quickly gain two electrons to become neutral helium, with builds up inside and weakens radium bromide crystals.

When radium decays, ionizing radiation is a product, which can excite fluorescent chemicals and cause radioluminescence.

Radium, in the form of radium chloride, was discovered by Marie and Pierre Curie in 1898.

This effect sometimes causes the crystals to break or even explode.) is a white compound that can be made by dissolving radium carbonate in nitric acid.