Astatine is a radioactive chemical element with symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth’s crust, occurring only as the decay product of various heavier elements.
A nemesgáz kifejezés a német Edelgas szó tükörfordításából ered, melyet először Hugo Erdmann használt 1898-ban, utalva ezzel az elemek rendkívül kicsi reaktivitására.
Soy gaz atomlarının, diğer çoğu gruplardaki atomlarda olduğu gibi, elektron sayısındaki artışa bağlı olarak bir periyottan diğerine geçişte atom yarıçapı yükselir.
History. Noble gas is translated from the German noun Edelgas, first used in 1898 by Hugo Erdmann to indicate their extremely low level of reactivity. The name makes an analogy to the term “noble metals”, which also have low reactivity.
Historia. Gas noble es una traducción del nombre alemán Edelgas, usado por primera vez en 1898 por Hugo Erdmann, [5] para indicar su extremadamente bajo nivel de reactiviman.
Office-based pulmonary function testing, also known as spirometry, is a powerful tool for primary care physicians to diagnose and manage respiratory problems.
A Collection of Interesting, Important, and Controversial Perspectives Largely Excluded from the American Mainstream Media
Scientists Warn: Deadly Ancient Pathogens Melting Out Of Ice In The Arctic Could Wipe Out Human Population
— P. Durbin, Human Radiation Studies: Remembering the Early Years , 1995
