Editing Meitnerium (section)

==Predicted properties==
Other than nuclear properties, no properties of meitnerium or its compounds have been measured; this is due to its extremely limited and expensive production{{Efn|In the millions of dollars<ref name="Bloomberg">{{Cite web |last=Subramanian |first=S. |author-link=Samanth Subramanian |date=2019 |title=Making New Elements Doesn't Pay. Just Ask This Berkeley Scientist |url=https://www.bloomberg.com/news/features/2019-08-28/making-new-elements-doesn-t-pay-just-ask-this-berkeley-scientist |archive-url=https://archive.today/20201114183428/https://www.bloomberg.com/news/features/2019-08-28/making-new-elements-doesn-t-pay-just-ask-this-berkeley-scientist |archive-date=November 14, 2020 |url-status=live |access-date=2020-01-18 |website=[[Bloomberg Businessweek]]}}</ref>}} and the fact that meitnerium and its parents decay very quickly. Properties of meitnerium metal remain unknown and only predictions are available.

===Chemical===
Meitnerium is the seventh member of the 6d series of [[transition metals]], and should be much like the [[platinum group metal]]s.<ref name="DoiX" /> Calculations on its [[ionization potential]]s and [[atomic radius|atomic]] and [[ionic radius|ionic radii]] are similar to that of its lighter homologue [[iridium]], thus implying that meitnerium's basic properties will resemble those of the other [[group 9 element]]s, [[cobalt]], [[rhodium]], and iridium.<ref name="Haire" />

Prediction of the probable chemical properties of meitnerium has not received much attention recently. Meitnerium is expected to be a [[noble metal]]. The [[standard electrode potential]] for the Mt<sup>3+</sup>/Mt couple is expected to be 0.8&nbsp;V. Based on the most stable oxidation states of the lighter group 9 elements, the most stable oxidation states of meitnerium are predicted to be the +6, +3, and +1 states, with the +3 state being the most stable in [[aqueous solution]]s. In comparison, rhodium and iridium show a maximum oxidation state of +6, while the most stable states are +4 and +3 for iridium and +3 for rhodium.<ref name="Haire" /> The oxidation state +9, represented only by iridium in [IrO<sub>4</sub>]<sup>+</sup>, might be possible for its congener meitnerium in the nonafluoride (MtF<sub>9</sub>) and the [MtO<sub>4</sub>]<sup>+</sup> cation, although [IrO<sub>4</sub>]<sup>+</sup> is expected to be more stable than these meitnerium compounds.<ref name="Mt(IX)" /> The tetrahalides of meitnerium have also been predicted to have similar stabilities to those of iridium, thus also allowing a stable +4 state.<ref name="MtX4" /> It is further expected that the maximum oxidation states of elements from bohrium (element 107) to [[darmstadtium]] (element 110) may be stable in the gas phase but not in aqueous solution.<ref name="Haire" />

===Physical and atomic===
Meitnerium is expected to be a solid under normal conditions and assume a [[face-centered cubic]] [[crystal structure]], similarly to its lighter [[congener (chemistry)|congener]] iridium.<ref name="bcc" /> It should be a very heavy metal with a [[density]] of around 27–28&nbsp;g/cm<sup>3</sup>, which would be among the highest of any of the 118 known elements.<ref name="density" /><ref name="kratz" /> Meitnerium is also predicted to be [[paramagnetic]].<ref name="paramagnetic" />

Theoreticians have predicted the covalent radius of meitnerium to be 6 to 10&nbsp;pm larger than that of iridium.<ref>{{cite journal|doi=10.1002/chem.200901472|pmid=19856342|title=Molecular Double-Bond Covalent Radii for Elements Li—E112|date=2009|last1=Pyykkö |first1=Pekka|last2=Atsumi|first2=Michiko|journal=Chemistry: A European Journal|volume=15|issue=46|pages=12770–9}}</ref> The atomic radius of meitnerium is expected to be around 128&nbsp;pm.{{Fricke1975}}