Heelium (He)
chemical element with symbol He and atomic number 2; rare gas
| Atomic Number | 2 |
|---|---|
| Atomic Weight | 4.002602 |
| massiarv | 4 |
| Group | 18 |
|---|---|
| Period | 1 |
| Block | s |
| prooton | 2 p+ |
|---|---|
| neutron | 2 n0 |
| elektron | 2 e- |
Füüsikalised Omadused
| Aatomiraadius | |
|---|---|
| molaarruumala | |
| Covalent Radius | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| density |
Keemilised Omadused
| energia | |
|---|---|
| proton affinity | |
| Elektronafiinsus | |
| ionization energy | |
| aurustumissoojus | |
| sulamissoojus | |
| standard enthalpy of formation | |
| elektron | |
| elektronkiht | 2 |
 | |
| valentselektron | 2 ⓘ |
 | |
| elektronkonfiguratsioon | 1s2ⓘ |
  | |
| oksüdatsiooniaste | |
| elektronegatiivsus | |
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter | {ERROR}|
| gaseous state of matter | Monoatomic |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| kolmikpunkt | |
| Välimus | |
| värvus | Black
|
| Välimus | colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field |
| Murdumisnäitaja | 1,000035
|
| thermodynamic material property | |
| Thermal Conductivity | |
| soojuspaisumine | |
| molar heat capacity | |
| Specific Heat Capacity | |
| heat capacity ratio | 5/3 |
| electrical properties | |
| type | |
| Elektrijuhtivus | |
| Eritakistus | |
| Ülijuhtivus | |
| Magnetism | |
| type | diamagnetic |
| Magnetiline vastuvõtlikkus (Mass) | −0,0000000059 m³/Kg
|
| Magnetiline vastuvõtlikkus (Molar) | −0,0000000000236 m³/mol
|
| Magnetiline vastuvõtlikkus (Volume) | −0,00000000105
|
| magnetic ordering | |
| Curie punkt | |
| Néel temperature | |
| struktuur | |
| Crystal Structure | {ERROR} |
| lattice constant | |
| Lattice Angles | π/2, π/2, π/2 |
| mechanical property | |
| kõvadus | |
| Ruumpaisumismoodul | |
| Nihkeelastsusmoodul | |
| Normaalelastsusmoodul | |
| Poissoni tegur | |
| heli kiirus | |
| Klassifitseerimine | |
| Category | Actinides, Noble gases |
| CAS Group | VIII |
| IUPAC Group | VIIIA |
| Glawe Number | 1 |
| Mendeleev Number | 112 |
| Pettifor Number | 1 |
| Geochemical Class | volatile |
| Goldschmidt classification | atmophile |
teine
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 0,007
|
| Neutron Mass Absorption | 0,00001
|
| Kvantarv | 1S0 |
| space group | 225 (Fm_3m) |
Isotopes of Helium
| Stable Isotopes | 2 |
|---|---|
| Unstable Isotopes | 6 |
| Natural Isotopes | 2 |
3He
| massiarv | 3 |
|---|---|
| neutron number | 1 |
| Relative Atomic Mass | |
| g-factor | −4,25525062 ± 0,00000006
|
| natural abundance | 0,0002 ± 0,0002
|
| radioaktiivsus | Stabiilne isotoop |
| Poolestusaeg | Not Radioactive ☢️ |
| spinn | 1/2 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1934 |
| parity | + |
4He
| massiarv | 4 |
|---|---|
| neutron number | 2 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | 99,9998 ± 0,0002
|
| radioaktiivsus | Stabiilne isotoop |
| Poolestusaeg | Not Radioactive ☢️ |
| spinn | 0 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1908 |
| parity | + |
5He
| massiarv | 5 |
|---|---|
| neutron number | 3 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 602 ± 22 ys
|
| spinn | 3/2 |
| nuclear quadrupole moment | |
| avastamise aeg | 1937 |
| parity | - |
| decay mode | Intensiivsus |
|---|---|
| n (neutron emission) | 100% |
6He
| massiarv | 6 |
|---|---|
| neutron number | 4 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 806,92 ± 0,24 ms
|
| spinn | 0 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1936 |
| parity | + |
| decay mode | Intensiivsus |
|---|---|
| β− (β− decay) | 100% |
| β− d (β−-delayed deuteron emission) | 0.000278% |
7He
| massiarv | 7 |
|---|---|
| neutron number | 5 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 2,51 ± 0,07 zs
|
| spinn | 3/2 |
| nuclear quadrupole moment | |
| avastamise aeg | 1967 |
| parity |
| decay mode | Intensiivsus |
|---|---|
| n (neutron emission) | 100% |
8He
| massiarv | 8 |
|---|---|
| neutron number | 6 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 119,5 ± 1,5 ms
|
| spinn | 0 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1965 |
| parity | + |
| decay mode | Intensiivsus |
|---|---|
| β− (β− decay) | 100% |
| β− n (β−-delayed neutron emission) | 16% |
| β− t (β−-delayed triton emission) | 0.9% |
9He
| massiarv | 9 |
|---|---|
| neutron number | 7 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 2,5 ± 2,3 zs
|
| spinn | 1/2 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1987 |
| parity |
| decay mode | Intensiivsus |
|---|---|
| n (neutron emission) | 100% |
10He
| massiarv | 10 |
|---|---|
| neutron number | 8 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiivsus | ☢️ radioactive element |
| Poolestusaeg | 260 ± 40 ys
|
| spinn | 0 |
| nuclear quadrupole moment | 0
|
| avastamise aeg | 1994 |
| parity | + |
| decay mode | Intensiivsus |
|---|---|
| 2n (2-neutron emission) | 100% |
ajalugu
| leiutaja või avastaja | Sir William Ramsey, Nils Langet, P.T.Cleve |
|---|---|
| location of discovery | Scotland/Sweden |
| avastamise aeg | 1895 |
| etümoloogia | Greek: hêlios (sun). |
| pronunciation | HEE-li-em (inglise) |
allikas
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (ookean) | |
| natural abundance (Inimkeha) | |
| natural abundance (meteoorkeha) | |
| natural abundance (Päike) | 23 %
|
| Abundance in Universe | 23 %
|
Nuclear Screening Constants
| 1 | s | 0.3125 |
