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Moscovium

Updated: 12/11/2025, 5:42:44 PM Wikipedia source

Moscovium is a synthetic chemical element; it has symbol Mc and atomic number 115. It was first synthesized in 2003 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. In December 2015, it was recognized as one of four new elements by the Joint Working Party of international scientific bodies IUPAC and IUPAP. On 28 November 2016, it was officially named after the Moscow Oblast, in which the JINR is situated. Moscovium is an extremely radioactive element: its most stable known isotope, moscovium-290, has a half-life of only 0.65 seconds. In the periodic table, it is a p-block transactinide element. It is a member of the 7th period and is placed in group 15 as the heaviest pnictogen. Moscovium is calculated to have some properties similar to its lighter homologues, nitrogen, phosphorus, arsenic, antimony, and bismuth, and to be a post-transition metal, although it should also show several major differences from them. In particular, moscovium should also have significant similarities to thallium, as both have one rather loosely bound electron outside a quasi-closed shell. Chemical experimentation on single atoms has confirmed theoretical expectations that moscovium is less reactive than its lighter homologue bismuth. Over a hundred atoms of moscovium have been observed to date, all of which have been shown to have mass numbers from 286 to 290.

Infobox

Pronunciation
/mɒˈskoʊviəm/ ⓘ (mo-SKOH-vee-əm)
Atomic number (Z)
115
Group
group 15 (pnictogens)
Period
period 7
Block
p-block
Electron configuration
[Rn] 5f14 6d10 7s2 7p3 (predicted)
Electrons per shell
2, 8, 18, 32, 32, 18, 5 (predicted)
at STP
solid (predicted)
Melting point
670 K (400 °C, 750 °F) (predicted)
Boiling point
1400 K ( 1100 °C, 2000 °F) (predicted)
Density (near r.t.)
13.5 g/cm3 (predicted)
Heat of fusion
5.90–5.98 kJ/mol (extrapolated)
Heat of vaporization
138 kJ/mol (predicted)
Oxidation states
common: (none) ( 1), ( 3)
Ionization energies
mw- 1st: 538.3 kJ/mol (predicted)2nd: 1760 kJ/mol (predicted)3rd: 2650 kJ/mol (predicted)(more)
Atomic radius
empirical: 187 pm (predicted)
Covalent radius
156–158 pm (extrapolated)
Natural occurrence
synthetic
CAS Number
54085-64-2
Naming
After Moscow region
Discovery
Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory (2003)
Main isotopes
mw- body Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct 286Mc synth 20 ms α 282Nh 287Mc synth 38 ms α 283Nh 288Mc synth 193 ms α 284Nh 289Mc synth 250 ms α 285Nh 290Mc synth 650 ms α 286Nh
286Mc
synth
287Mc
synth
288Mc
synth
289Mc
synth
290Mc
synth

Tables

mw- Isotope
mw- Isotope
Main isotopes
mw- Isotope
Main isotopes
abun­dance
Main isotopes
half-life (t1/2)
Decay
mode
Decay
pro­duct
286Mc
286Mc
Main isotopes
286Mc
Main isotopes
synth
Main isotopes
20 ms
Decay
α
Decay
282Nh
287Mc
287Mc
Main isotopes
287Mc
Main isotopes
synth
Main isotopes
38 ms
Decay
α
Decay
283Nh
288Mc
288Mc
Main isotopes
288Mc
Main isotopes
synth
Main isotopes
193 ms
Decay
α
Decay
284Nh
289Mc
289Mc
Main isotopes
289Mc
Main isotopes
synth
Main isotopes
250 ms
Decay
α
Decay
285Nh
290Mc
290Mc
Main isotopes
290Mc
Main isotopes
synth
Main isotopes
650 ms
Decay
α
Decay
286Nh
Main isotopes
Decay
mw- Isotope
abun­dance
half-life (t1/2)
mode
pro­duct
286Mc
synth
20 ms
α
282Nh
287Mc
synth
38 ms
α
283Nh
288Mc
synth
193 ms
α
284Nh
289Mc
synth
250 ms
α
285Nh
290Mc
synth
650 ms
α
286Nh

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