The maximum dimensions for your carry-on bag are: Length - 24 (61cm) including wheels and handles ; Width - 17 (43cm) Height - 10 (25cm) For additional carry-on items beyond the one-bag limit, each piece will incur a fee. Refer to the checked baggage page for more information.
Tritium (3H) is the most stable radioisotope of hydrogen. That is, of all radioactive isotopes of hydrogen, tritium is the least radioactive. It has a proton and 2 neutrons in its nucleus. Tritium decays through beta minus decay and changes to helium-3. It has a half-life of 12.32 years.
Meitnerium is a radioactive, synthetic element about which little is known. It is classified as a metal and is a solid at room temperature. Meitnerium has seven isotopes with known half-lives. The most stable is meitnerium-278 (278 Mt), with a half-life of about eight seconds. It decays into bohrium-274 (274Bh) through alpha decay. The atomic weight for manmade transuranium elements is based on the longest-lived isotope.