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 … 展开

Radium is the heaviest known alkaline earth metal and is the only radioactive member of its group. Its physical and chemical properties most … 展开

Radium only exhibits the oxidation state of +2 in solution. It forms the colorless Ra cation in aqueous solution, which is highly basic and … 展开

Uranium had no large scale application in the late 19th century and therefore no large uranium mines existed. In the beginning, the silver mines in Jáchymov, Austria-Hungary 展开

Radium has 33 known isotopes with mass numbers from 202 to 234, all of which are radioactive. Four of these – Ra (half-life 11.4 days), Ra (3.64 days), Ra (1600 years), and Ra (5.75 years) – occur naturally in the decay chains of primordial thorium-232, 展开

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 … 展开

Radium is seeing increasing use in the field of atomic, molecular, and optical physics. Symmetry breaking forces scale proportional to $${\displaystyle \ Z^{3}\ ,}$$ which … 展开