Anthem Blue Cross and Blue Shield is the trade name of: In Indiana: Anthem Insurance Companies, Inc. In Kentucky: Anthem Health Plans of Kentucky, Inc. In Missouri (excluding 30 counties in the Kansas City area): RightCHOICEÂ®. Managed Care, Inc. (RIT), Healthy AllianceÂ® Life Insurance Company (HALIC), and HMO Missouri, Inc. RIT and certain.
Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table.
Francium is the most unstable of the naturally occurring elements: its most stable isotope, francium-223, has a half-life of only 22 minutes. In contrast, astatine, the second-least stable naturally occurring element, has a half-life of 8.5 hours. All isotopes of francium decay into astatine, radium, or radon. Francium is also less stable than all synthetic elements up to element 105.