Helium (He)
He
| Atomic Number | 2 |
|---|---|
| Atomic Weight | 4.002602 |
| Massagetal | 4 |
| Group | 18 |
|---|---|
| Period | 1 |
| Block | s |
| proton | 2 p+ |
|---|---|
| neutron | 2 n0 |
| elektron | 2 e- |
Physical Property
| Atoomradius | |
|---|---|
| molar volume | |
| Covalent Radius | |
| Metallic Radius | |
| Ioonradius | |
| Crystal Radius | |
| Van der Waals radius | |
| density |
Chemical Property
| energie | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| Verdampingswarmte | |
| smeltingswarmte | |
| Vormingsentalpie | |
| elektron | |
| Elektronskil | 2 |
 | |
| Valenselektrone | 2 ⓘ |
 | |
| elektronkonfigurasie | 1s2ⓘ |
  | |
| Oksidasietoestand | |
| Elektronegatiwiteit | |
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter | {ERROR}|
| gaseous state of matter | Monoatomic |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| triple point | |
| appearance | |
| kleur | Black
|
| appearance | colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field |
| Brekingsindeks | 1,000035
|
| thermodynamic material property | |
| Thermal Conductivity | |
| thermal expansion | |
| molar heat capacity | |
| Specific Heat Capacity | |
| heat capacity ratio | 5/3 |
| electrical properties | |
| type | |
| Geleidingsvermoë | |
| Elektriese resistiwiteit | |
| superconductivity | |
| Magnetisme | |
| type | diamagnetic |
| magnetic susceptibility (Mass) | -0,0000000059 m³/Kg
|
| magnetic susceptibility (Molar) | -0,0000000000236 m³/mol
|
| magnetic susceptibility (Volume) | -0,00000000105
|
| magnetic ordering | |
| Curie temperature | |
| Néel temperature | |
| structure | |
| Crystal Structure | {ERROR} |
| lattice constant | |
| Lattice Angles | π/2, π/2, π/2 |
| mechanical property | |
| hardness | |
| Massamodulus | |
| Skuifmodulus | |
| Young se modulus | |
| Poisson se verhouding | |
| Spoed van klank | |
| classification | |
| 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 |
other
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 0,007
|
| Neutron Mass Absorption | 0,00001
|
| quantum number | 1S0 |
| Ruimtegroep | 225 (Fm_3m) |
Isotopes of Helium
| Stable Isotopes | 2 |
|---|---|
| Unstable Isotopes | 6 |
| Natural Isotopes | 2 |
3He
| Massagetal | 3 |
|---|---|
| neutron number | 1 |
| Relative Atomic Mass | |
| g-factor | -4,25525062 ± 0,00000006
|
| natural abundance | 0,0002 ± 0,0002
|
| radioaktiwiteit | Stabiele isotoop |
| Halfleeftyd | Not Radioactive ☢️ |
| spin | 1/2 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1934 |
| parity | + |
4He
| Massagetal | 4 |
|---|---|
| neutron number | 2 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | 99,9998 ± 0,0002
|
| radioaktiwiteit | Stabiele isotoop |
| Halfleeftyd | Not Radioactive ☢️ |
| spin | 0 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1908 |
| parity | + |
5He
| Massagetal | 5 |
|---|---|
| neutron number | 3 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 602 ± 22 ys
|
| spin | 3/2 |
| nuclear quadrupole moment | |
| ontdekkingsdatum | 1937 |
| parity | - |
| decay mode | intensity |
|---|---|
| n (neutron emission) | 100% |
6He
| Massagetal | 6 |
|---|---|
| neutron number | 4 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 806,92 ± 0,24 ms
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1936 |
| parity | + |
| decay mode | intensity |
|---|---|
| β− (β− decay) | 100% |
| β− d (β−-delayed deuteron emission) | 0.000278% |
7He
| Massagetal | 7 |
|---|---|
| neutron number | 5 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 2,51 ± 0,07 zs
|
| spin | 3/2 |
| nuclear quadrupole moment | |
| ontdekkingsdatum | 1967 |
| parity |
| decay mode | intensity |
|---|---|
| n (neutron emission) | 100% |
8He
| Massagetal | 8 |
|---|---|
| neutron number | 6 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 119,5 ± 1,5 ms
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1965 |
| parity | + |
| decay mode | intensity |
|---|---|
| β− (β− decay) | 100% |
| β− n (β−-delayed neutron emission) | 16% |
| β− t (β−-delayed triton emission) | 0.9% |
9He
| Massagetal | 9 |
|---|---|
| neutron number | 7 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 2,5 ± 2,3 zs
|
| spin | 1/2 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1987 |
| parity |
| decay mode | intensity |
|---|---|
| n (neutron emission) | 100% |
10He
| Massagetal | 10 |
|---|---|
| neutron number | 8 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioaktiwiteit | ☢️ radioactive element |
| Halfleeftyd | 260 ± 40 ys
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| ontdekkingsdatum | 1994 |
| parity | + |
| decay mode | intensity |
|---|---|
| 2n (2-neutron emission) | 100% |
geskiedenis
| Ontdek deur | Sir William Ramsey, Nils Langet, P.T.Cleve |
|---|---|
| ligging van ontdekking | Scotland/Sweden |
| ontdekkingsdatum | 1895 |
| etimologie | Greek: hêlios (sun). |
| uitspraak | HEE-li-em (Engels) |
source
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (oseaan) | |
| natural abundance (human body) | |
| natural abundance (Meteoroïde) | |
| natural abundance (Son) | 23 %
|
| Abundance in Universe | 23 %
|
Nuclear Screening Constants
| 1 | s | 0.3125 |
