Ununennium, or element 119, is a predicted chemical element. Its symbol is Uue. Ununennium and Uue are substitute names made by the IUPAC, (meaning "one-one-nine-ium" in Latin) until permanent names are made. Ununennium is the element with the smallest atomic number that has not been created yet. Qualities of Ununennium are unknown, but many are predicted. It is predicted all isotopes will be radioactive. It is thought to be an alkali metal.[8]
Quick Facts Pronunciation, Alternative names ...
Ununennium, 00Uue|
Pronunciation | (OON-oon-EN-ee-əm) |
---|
Alternative names | element 119, eka-francium |
---|
|
|
Group | group 1: hydrogen and alkali metals |
---|
Period | period 8 (theoretical, extended table) |
---|
Block | s-block |
---|
Electron configuration | [Og] 8s1 (predicted)[1] |
---|
Electrons per shell | 2, 8, 18, 32, 32, 18, 8, 1 (predicted) |
---|
|
Phase at STP | unknown (could be solid or liquid)[1] |
---|
Melting point | 273–303 K (0–30 °C, 32–86 °F) (predicted)[1] |
---|
Boiling point | 903 K (630 °C, 1166 °F) (predicted)[2] |
---|
Density (near r.t.) | 3 g/cm3 (predicted)[1] |
---|
Heat of fusion | 2.01–2.05 kJ/mol (extrapolated)[3] |
---|
|
Oxidation states | (+1), (+3), (+5) (predicted)[1][4] |
---|
Electronegativity | Pauling scale: 0.86 (predicted)[5] |
---|
Ionization energies | - 1st: 463.1 kJ/mol
- 2nd: 1698.1 kJ/mol
- (predicted)[6]
|
---|
Atomic radius | empirical: 240 pm (predicted)[1] |
---|
Covalent radius | 263–281 pm (extrapolated)[3] |
---|
|
Crystal structure | body-centered cubic (bcc) (extrapolated)[7] |
---|
CAS Number | 54846-86-5 |
---|
|
Naming | IUPAC systematic element name |
---|
|
Template:infobox ununennium isotopes does not exist |
Category: Ununennium | references |
Close
Many attempts have been made by American, German, and Russian teams to make ununennium but all have failed. Japanese and Russian failed to produce the element after work in both 2019 and 2020.