Rutherfordium |
---|
Pronunciation | i (RUDH-ər-FOR-dee-əm) |
---|
Mass number | [267] |
---|
Rutherfordium in the periodic cairt |
---|
|
Hf ↑ Rf ↓ (Uph)
|
lawrencium ← rutherfordium → dubnium
|
| |
Atomic nummer (Z) | 104 |
---|
Group | group 4 |
---|
Period | period 7 |
---|
Block | d-block |
---|
Element category | Transeetion metal |
---|
Electron confeeguration | [Rn] 5f14 6d2 7s2[1][2] |
---|
Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |
---|
Pheesical properties |
---|
Phase at STP | solit (predictit)[3][2] |
---|
Meltin pynt | 2400 K (2100 °C, 3800 °F) (predictit)[3][2] |
---|
Bylin pynt | 5800 K (5500 °C, 9900 °F) (predictit)[3][2] |
---|
Density (near r.t.) | 23.2 g/cm3 (predictit)[3][2][4] |
---|
Atomic properties |
---|
Oxidation states | (+2), (+3), +4[1][2][4] (Template:Engvar: prediction) |
---|
Ionisation energies | - 1st: 579.9 kJ/mol
- 2nd: 1389.4 kJ/mol
- 3rd: 2296.4 kJ/mol
- (more) (all estimated)[2]
|
---|
Atomic radius | empirical: 150 pm (estimatit)[2] |
---|
Covalent radius | 157 pm (estimatit)[3] |
---|
Ither properties |
---|
Naitural occurrence | synthetic |
---|
Creestal structur | hexagonal close-packed (hcp) (predicted)[5] |
---|
CAS Nummer | 53850-36-5 |
---|
History |
---|
Namin | after Ernest Rutherford |
---|
Diskivery | Jynt Institute for Nuclear Research (1964) |
---|
Main isotopes o rutherfordium |
---|
Isotope
|
Abundance
|
Hauf-life (t1/2)
|
Decay mode
|
Product
|
261Rf
|
syn
|
70 s[6]
|
>80% α
|
257No
|
<15% ε
|
261Lr
|
<10% SF
|
|
263Rf
|
syn
|
15 min[6]
|
<100% SF
|
|
~30% α
|
259No
|
265Rf
|
syn
|
1.0+1.2 −0.3 min[7][8][9]
|
SF
|
|
266Rf?
|
syn
|
10? h
|
SF?/α?
|
|
267Rf
|
syn
|
1.3 h[6]
|
SF
|
|
268Rf?
|
syn
|
6? h
|
SF?/α?
|
| |
| references |