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Radium is a chemical element; it has 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. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra 3 N 2).
Radium compounds are compounds containing the element radium (Ra). Due to radium's radioactivity, not many compounds have been well characterized. Solid radium compounds are white as radium ions provide no specific coloring, but they gradually turn yellow and then dark over time due to self-radiolysis from radium's alpha decay. [1]
radium-216: 182 plutonium-239m1: 193 bismuth-203m2: 194 polonium-198m1: 200 ... List of elements by stability of isotopes; List of nuclides; Orders of magnitude (time)
The radium isotope (226 Ra) used has a half-life of about 1,600 years, [7] so radium dials remain essentially just as radioactive as when originally painted 50 or 100 years ago, whether or not they remain luminous. Radium dials held near the face have been shown to produce radiation doses in excess of 10 μSv / hour.
The longest lived isotope of radium is radium-226 with a half-life of 1600 years; it along with radium-223, -224, and -228 occur naturally in the decay chains of primordial thorium and uranium. Beryllium-8 is notable by its absence as it splits in half virtually instantaneously into two alpha particles whenever it is formed.
Radium (88 Ra) has no stable or nearly stable isotopes, and thus a standard atomic weight cannot be given. The longest lived, and most common, isotope of radium is 226 Ra with a half-life of 1600 years. 226 Ra occurs in the decay chain of 238 U (often referred to as the radium series). Radium has 34 known isotopes from 201 Ra to 234 Ra.
Dr. Aseem Malhotra, a cardiologist and public health campaigner based in London, says Americans' foods are fueling chronic diseases. He shares his warnings and tips with Fox News Digital.
This named isotope later became the official name for element 88. RaA: Radium A: 84: From radium and A. Placeholder name given at one time to 218 Po, an isotope of polonium identified in the decay chain of radium. RaB: Radium B: 82: From radium and B. Placeholder name given at one time to 214 Pb, an isotope of lead identified in the decay chain ...