It is an extremely radioactive synthetic element (an element not found in nature, but can be created in a laboratory).
Meitnerium is a synthetic chemical element with the symbol Mt and atomic number 109.
In the periodic table, meitnerium is a d-block transactinide element.
It is a member of the 7th period and is placed in the group 9 elements, although no chemical experiments have yet been carried out to confirm that it behaves as the heavier homologue to iridium in group 9 as the seventh member of the 6d series of transition metals.
Meitnerium is calculated to have similar properties to its lighter homologues, cobalt, rhodium, and iridium.
Names and Identifiers
|Molecular Weight:||278.156 g/mol|
|EC Number :||n/a|
|Color:||unknown (presumably metallic/ silvery white/ gray)|
Physical & Chemical Properties
All meitnerium isotopes are extremely unstable and radioactive; in general, heavier isotopes are more stable than the lighter. The most stable known meitnerium isotope, 278Mt, is also the heaviest known
|Isotope||Mass/Da||Half-life||Mode of decay||Nuclear spin||Nuclear magnetic moment|
|266Mt||266.13764 (45)||0.0034 s||α to 262Bh; SF|
|268Mt||268.1388||0.070 s||α to 264Bh|
|275Mt||275||0.0097 s||α to 271Bh|
|276Mt||276||0.72 s||α to 272Bh|