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.
The most stable isotope of astatine is At-210, which has a half-life of about 8.1 hours. This isotope's primary decay mode is positron emission to the relatively long-lived alpha emitter, polonium-210. In total, only five isotopes of astatine have half-lives exceeding one hour: those between 207 and 211.
Astatineâs Periodic Table Neighborhood. Astatine is the heaviest verified element in Group 17. Like the other halogens, it is a nonmetal, although it shows more metallic character in its chemistry than the others. Astatine and the elements on either side of it, polonium and radon, have no stable isotopes.statineâs Periodic Table Neighborhood. Astatine is the heaviest verified element in Group 17. Like the other halogens, it is a nonmetal, although it shows more metallic character in its chemistry than the others. Astatine and the elements on either side of it, polonium and radon, have no stable isotopes.