Helij

Helij (He)

kemijski element simbola He, lagani plemeniti plin, korišten za punjenje balona
Atomski broj2
Relativna atomska masa4.002602
Maseni broj4
Skupina18
Perioda1
Bloks
proton2 p+
neutron2 n0
elektron2 e-
Animated Bohrov model atoma of He (Helij)

Svojstva

physical property
Atomski radijus
120 pm
Molni volumen
31,8 cm³/mol
Kovalentni radijus
46 pm
Metallic Radius
Ionski radijus
Crystal Radius
Van der Waals radius
140 pm
gustoća
0,000164 g/cm³
energija
proton affinity
177,8 kJ/mol
Elektronski afinitet
-19,7 eV/particle
ionization energy
24,587387936 eV/particle
ionization energy of He (Helij)
Toplina isparivanja
0,08 kJ/mol
toplina taljenja
standard enthalpy of formation
elektron
Elektronska ljuska2
Bohrov model atoma: He (Helij)
valence electron2 ⓘ
Lewis structure: He (Helij)
electron configuration1s2ⓘ
Enhanced Bohrov model atoma of He (Helij)
Orbital Diagram of He (Helij)
Oksidacijski broj
Elektronegativnost
Electrophilicity Index
0,0674191963846371 eV/particle
fundamental state of matter
agregatno stanjePlinovito
gaseous state of matterMonoatomic
Vrelište
4,222 K
Talište
critical pressure
0,22746 MPa
critical temperature
5,195 K
Trojna točka
2,177 K
5,043 kPa
appearance
boja
Bezbojan
appearancecolorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
Indeks prelamanja
1,000035
thermodynamic material property
Toplinska vodljivost
0,152 W/(m K)
Toplinsko istezanje
molar heat capacity
20,786 J/(mol K)
Specifični toplinski kapacitet
5,193 J/(g⋅K)
heat capacity ratio5/3
electrical properties
type
electrical conductivity
Električna otpornost i provodnost
Supravodljivost
Magnetizam
typediamagnetic
Magnetna susceptibilnost (Mass)
-0,0000000059 m³/Kg
Magnetna susceptibilnost (Molar)
-0,0000000000236 m³/mol
Magnetna susceptibilnost (Volume)
-0,00000000105
magnetic ordering
Curieva temperatura
Néel temperature
struktura
Kristalna strukturaKubna plošno centrirana (HEX)
lattice constant
3,57 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
Tvrdoća
bulk modulus
shear modulus
Youngov modul elastičnosti
Poissonov omjer
brzina zvuka
970 m/s
classification
KategorijaPlemeniti plinovi, Noble gases
CAS GroupVIII
IUPAC GroupVIIIA
Glawe Number1
Mendeleev Number112
Pettifor Number1
Geochemical Classvolatile
Goldschmidt classificationatmophile
other
Gas Basicity
148,5 kJ/mol
polarizability
1,38375 ± 0,00002 a₀
C6 Dispersion Coefficient
1,42 a₀
allotrope
Nuklearni udarni presjek
0,007
Neutron Mass Absorption
0,00001
Kvantni brojevi1S0
space group225 (Fm_3m)

Isotopes of Helium

Stabilni izotopi2
Nestabilni izotopi6
Radioactive Isotopes6
Isotopic Composition4100.00%4100.00%30.00%30.00%

3He

Maseni broj3
neutron number1
Relativna atomska masa
3,01602932197 ± 0,00000000006 Da
g-factor
-4,25525062 ± 0,00000006
natural abundance
0,0002 ± 0,0002
radioaktivnoststable isotope
Vrijeme poluraspadaNot Radioactive ☢️
spin1/2
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1934
Parnost+

4He

Maseni broj4
neutron number2
Relativna atomska masa
4,00260325413 ± 0,00000000016 Da
g-factor
0
natural abundance
99,9998 ± 0,0002
radioaktivnoststable isotope
Vrijeme poluraspadaNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1908
Parnost+

5He

Maseni broj5
neutron number3
Relativna atomska masa
5,012057224 ± 0,00002147 Da
g-factor
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
602 ± 22 ys
spin3/2
nuclear quadrupole moment
vrijeme otkrića ili izuma1937
Parnost-
decay modeintensity
n (neutron emission)100%

6He

Maseni broj6
neutron number4
Relativna atomska masa
6,018885889 ± 0,000000057 Da
g-factor
0
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
806,92 ± 0,24 ms
spin0
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1936
Parnost+
decay modeintensity
β− (β− decay)100%
β− d (β−-delayed deuteron emission)0.000278%

7He

Maseni broj7
neutron number5
Relativna atomska masa
7,027990652 ± 0,000008115 Da
g-factor
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
2,51 ± 0,07 zs
spin3/2
nuclear quadrupole moment
vrijeme otkrića ili izuma1967
Parnost
decay modeintensity
n (neutron emission)100%

8He

Maseni broj8
neutron number6
Relativna atomska masa
8,033934388 ± 0,000000095 Da
g-factor
0
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
119,5 ± 1,5 ms
spin0
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1965
Parnost+
decay modeintensity
β− (β− decay)100%
β− n (β−-delayed neutron emission)16%
β− t (β−-delayed triton emission)0.9%

9He

Maseni broj9
neutron number7
Relativna atomska masa
9,043946414 ± 0,000050259 Da
g-factor
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
2,5 ± 2,3 zs
spin1/2
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1987
Parnost
decay modeintensity
n (neutron emission)100%

10He

Maseni broj10
neutron number8
Relativna atomska masa
10,052815306 ± 0,000099676 Da
g-factor
0
natural abundance
radioaktivnost☢️ radioactive element
Vrijeme poluraspada
260 ± 40 ys
spin0
nuclear quadrupole moment
0
vrijeme otkrića ili izuma1994
Parnost+
decay modeintensity
2n (2-neutron emission)100%
Helium discharge tube

povijest

otkrio/izumioSir William Ramsey, Nils Langet, P.T.Cleve
location of discoveryScotland/Sweden
vrijeme otkrića ili izuma1895
EtimologijaGreek: hêlios (sun).
pronunciationHEE-li-em (engleski)

source

Obilnost
Zastupljenost u Zemljinoj kori
0,008 mg/kg
natural abundance (ocean)
0,000007 mg/L
natural abundance (tijelo)
natural abundance (meteoroid)
natural abundance (Sunce)
23 %
Zastupljenost u svemiru
23 %

Nuclear Screening Constants

1s0.3125
Helij on ChemicalAid