115
Mc
(290)
Moscovium
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³ · 2 · 8 · 18 · 32 · 32 · 18 · 5
An element named after Moscow Oblast, where Dubna lies. Moscovium decays into nihonium, and observing that chain helped confirm the discovery of element 113.
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Atomic properties
- Atomic number
- 115
- Atomic mass
- 290 а.е.м. ≈
- Electron configuration
- [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³
- Electrons per shell
- 2 · 8 · 18 · 32 · 32 · 18 · 5
- Block
- p-block
- Group
- Pnictogens
- Period
- 7
- Electronegativity (Pauling)
- no data
- Electronegativity (Allen)
- no data
- Atomic radius
- no data
- Covalent radius
- 162 pm
- Van der Waals radius
- no data
- Ionisation energy 1
- 538.4 kJ/mol ≈
- Electron affinity
- 35.3 kJ/mol ≈
- Common oxidation states
- +1
- Oxidation states
- +1, +3
№4 / 118
№48 / 118
№103 / 118
№69 / 108
Physical properties
- State at 25 °C
- solid
- Density
- 13.5 g/cm³ ≈
- Melting point
- 670 K · 396.9 °C ≈
- Boiling point
- 1 400 K · 1 126.9 °C ≈
- Speed of sound
- no data
№28 / 118
№76 / 111
№72 / 107
Thermal properties
- Heat of fusion
- no data
- Heat of vaporisation
- no data
- Specific heat capacity
- no data
- Thermal conductivity
- no data
Mechanical properties
- Young's modulus
- no data
- Shear modulus
- no data
- Bulk modulus
- no data
- Poisson ratio
- no data
- Mohs hardness
- no data
- Brinell hardness
- no data
Electrical and magnetic properties
- Electrical resistivity
- no data
- Magnetic ordering
- no data
- Curie point
- no data
- Néel point
- no data
- Superconducting point
- no data
Crystal structure
- Crystal structure
- no data
- Lattice constants
- no data
Abundance
- In the crust
- 0 mg/kg
- In the ocean
- 0 mg/L
- In the universe
- 0 mg/kg
- In the human body
- 0 mg/kg
№88 / 88
№78 / 78
№83 / 83
№40 / 40
Isotopes
| Isotope | Abundance | Half-life | Decay mode |
|---|---|---|---|
| 288Mc | — | 0.17 s | α |
| 290Mc | — | 0.65 s | α |
Moscovium-290, half-life about 0.65 seconds, is the longest-lived known isotope.
Discovery
- Year of discovery
- 2003
- Discovered by
- JINR and Lawrence Livermore
- Where
- Dubna, Russia
- Origin of the name
- after Moscow Oblast, where Dubna lies
№3 / 108
History
JINR with Lawrence Livermore synthesised element 115 in 2003 by bombarding americium-243 with calcium-48 ions. The name was confirmed in 2016.
Where it occurs
Absent from nature.
How it is produced
By nuclear fusion: americium-243 bombarded with calcium-48 ions.
Role in living things
No biological role.
Safety
Only single atoms are ever handled.
Uses
Fundamental research
Curiosities
- The moscovium decay chain runs through nihonium, confirming two elements at once.
- The name refers to Moscow Oblast, not to the city of Moscow.
- Element 115 featured in UFO conspiracy stories long before it was actually synthesised.
- Elements 115 and 117 were made by Russian and American laboratories working together at a low point in political relations.