|
Pronunciation | (ni-HOH-nee-əm) |
---|
Mass number | 286 (most stable isotope) |
---|
|
|
Atomic number (Z) | 113 |
---|
Group | group 13 (boron group) |
---|
Period | period 7 |
---|
Block | p-block |
---|
Element category | unknown chemical properties, but probably a post-transition metal |
---|
Electron configuration | [Rn] 5f14 6d10 7s2 7p1 (predicted) |
---|
Electrons per shell | 2, 8, 18, 32, 32, 18, 3 (predicted) |
---|
|
Phase at STP | Nh: Unknown phase (predicted) |
---|
Melting point | 700 K (430 °C, 810 °F) (predicted) |
---|
Boiling point | 1430 K (1130 °C, 2070 °F) (predicted) |
---|
Density (near r.t.) | 16 g/cm3 (predicted) |
---|
Heat of fusion | 7.61 kJ/mol (extrapolated) |
---|
Heat of vaporization | 130 kJ/mol (predicted) |
---|
|
Oxidation states | (−1), (+1), (+3), (+5) (predicted) |
---|
Ionization energies | - 1st: 704.9 kJ/mol (predicted)
- 2nd: 2240 kJ/mol (predicted)
- 3rd: 3020 kJ/mol (predicted)
- (more)
|
---|
Atomic radius | empirical: 170 pm (predicted) |
---|
Covalent radius | 172–180 pm (extrapolated) |
---|
|
Natural occurrence | Nh: Synthetic |
---|
Crystal structure | hexagonal close-packed (hcp) (extrapolated) |
---|
CAS Number | 54084-70-7 |
---|
|
Naming | After Japan (Nihon in Japanese) |
---|
Discovery | Riken (Japan, first undisputed claim 2004) JINR (Russia) and Livermore (US, first announcement 2003) |
---|
|
|
| references |