Helium (He)

chemical element with symbol He and atomic number 2; rare gas

Atomic Number	2
Atomic Weight	4.002602
Nombor jisim	4

Group	18
Period	1
Block	s

proton	2 p⁺
neutron	2 n⁰
Elektron	2 e^-

Sifat Fizikal

Jejari Atom	120 pm 134 pm
molar volume	31.8 cm³/mol
Jejari kovalen	46 pm 28 pm
Metallic Radius	122 pm
ionic radius
Crystal Radius
Jejari van der Waals	140 pm 140 pm 153 pm 236.2 pm
ketumpatan	0.000164 g/cm³

Sifat Kimia

tenaga

proton affinity	177.8 kJ/mol
Pertalian elektron	-19.7 eV/particle
ionization energy	24.587387936 eV/particle 54.41776311 eV/particle

Entalpi pengewapan	0.08 kJ/mol
entalpi pelakuran
standard enthalpy of formation
Elektron

Petala elektron	2

Elektron valens	2 ⓘ

tatarajah elektron	1s²ⓘ

Keadaan pengoksidaan
Keelektronegatifan	24.59 eV/particle 0.442712
Electrophilicity Index	0.0674191963846371 eV/particle
keadaan jirim asas

fasa jirim	Gas
gaseous state of matter	Monoatomic
Boiling Point	4.222 K
Melting Point
critical pressure	0.22746 MPa
critical temperature	5.195 K
triple point	2.177 K 5.043 kPa
rupa
warna	Colorless #ffc0cb #d9ffff #d9ffff
rupa	colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
indeks biasan	1.000035
sifat bahan
Thermal Conductivity	0.152 W/(m K)
Pengembangan terma
molar heat capacity	20.786 J/(mol K)
Specific Heat Capacity	5.193 J/(g⋅K)
heat capacity ratio	5/3
electrical properties
type
Kekonduksian elektrik
Kerintangan dan kekonduksian elektrik
Kesuperkonduksian
kemagnetan
type	diamagnetic
magnetic susceptibility (Mass)	-0.0000000059 m³/Kg
magnetic susceptibility (Molar)	-0.0000000000236 m³/mol
magnetic susceptibility (Volume)	-0.00000000105
magnetic ordering
Suhu Curie
Néel temperature
struktur
Crystal Structure	Face Centered Cubic (HEX)
lattice constant	3.57 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness
Modulus pukal
shear modulus
Young's modulus
Nisbah Poisson
Kelajuan bunyi	970 m/s
pengelasan
Category	Noble gases, 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	148.5 kJ/mol
polarizability	1.38375 ± 0.00002 a₀
C6 Dispersion Coefficient	1.42 a₀ 1.47 a₀
allotrope
Neutron cross section	0.007
Neutron Mass Absorption	0.00001
Nombor kuantum	1S0
space group	225 (Fm_3m)

Isotopes of Helium

Stable Isotopes	2
Unstable Isotopes	6
Natural Isotopes	2

³He

Nombor jisim	3
nombor neutron	1
Jisim Atom Relatif	3.01602932197 ± 0.00000000006 Da
g-factor	-4.25525062 ± 0.00000006
natural abundance	0.0002 ± 0.0002
Reputan radioaktif	Isotop stabil
setengah hayat	Not Radioactive ☢️
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1934
parity	+

⁴He

Nombor jisim	4
nombor neutron	2
Jisim Atom Relatif	4.00260325413 ± 0.00000000016 Da
g-factor	0
natural abundance	99.9998 ± 0.0002
Reputan radioaktif	Isotop stabil
setengah hayat	Not Radioactive ☢️
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1908
parity	+

⁵He

Nombor jisim	5
nombor neutron	3
Jisim Atom Relatif	5.012057224 ± 0.00002147 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	602 ± 22 ys
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	1937
parity	-

decay mode	Keamatan (fizik)
n (neutron emission)	100%

⁶He

Nombor jisim	6
nombor neutron	4
Jisim Atom Relatif	6.018885889 ± 0.000000057 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	806.92 ± 0.24 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1936
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%
β⁻ d (β⁻-delayed deuteron emission)	0.000278%

⁷He

Nombor jisim	7
nombor neutron	5
Jisim Atom Relatif	7.027990652 ± 0.000008115 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	2.51 ± 0.07 zs
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	1967
parity

decay mode	Keamatan (fizik)
n (neutron emission)	100%

⁸He

Nombor jisim	8
nombor neutron	6
Jisim Atom Relatif	8.033934388 ± 0.000000095 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	119.5 ± 1.5 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1965
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	16%
β⁻ t (β⁻-delayed triton emission)	0.9%

⁹He

Nombor jisim	9
nombor neutron	7
Jisim Atom Relatif	9.043946414 ± 0.000050259 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	2.5 ± 2.3 zs
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1987
parity

decay mode	Keamatan (fizik)
n (neutron emission)	100%

¹⁰He

Nombor jisim	10
nombor neutron	8
Jisim Atom Relatif	10.052815306 ± 0.000099676 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	260 ± 40 ys
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1994
parity	+

decay mode	Keamatan (fizik)
2n (2-neutron emission)	100%

sejarah

penemu atau pereka	Sir William Ramsey, Nils Langet, P.T.Cleve
tempat penemuan	Scotland/Sweden
tarikh penemuan	1895
Etimologi	Greek: hêlios (sun).
sebutan	HEE-li-em (Inggeris)

sumber

Abundance
Abundance in Earth's crust	0.008 mg/kg
natural abundance (lautan)	0.000007 mg/L
natural abundance (Tubuh manusia)
natural abundance (Meteoroid)
natural abundance (Matahari)	23 %
Abundance in Universe	23 %

Nuclear Screening Constants

0.3125

Helium on ChemicalAid

ChEBI ID	30217
ChEMBL ID	CHEMBL1796997
ChemSpider ID	22423
Common Procurement Vocabulary	24111300
DSSTOX compound identifier	DTXCID5016402
DrugBank ID	09155
ECHA Substance Infocard ID	100.028.334
Golden ID	Helium-K8NB
HSDB ID	553
ICSC ID	0603
ID BnF	11978648w
ID CAB	178029
ID De Agostini	èlio
ID Den Store Danske	helium
ID Encyclopædia Universalis	helium
ID Ensiklopedia Besar Rusia dalam talian	2348591
ID Ensiklopedia Britannica Dalam Talian	science/helium-chemical-element
ID Freebase	/m/025rt79
ID GND	4132459-6
ID J9U Perpustakaan Negara Israel	987007555644805171
ID KBpedia	Helium
ID NE.se	helium
ID NKCR AUT	ph503003
ID Namuwiki	헬륨
ID PSH	5816
ID Perbendaharaan Kata Pendidikan Australia	scot/3528
ID Store norske leksikon	helium
ID Tesaurus BNCF	19752
ID Treccani	elio
ID Vikidia Perancis	Hélium
ID WordNet 3.1 Synset	14664099-n
ID YSO	14499
ID bahan DSSTox	DTXSID7036402
ID dalam talian Brockhaus Enzyklopädie	helium-20
ID kewibawaan Perpustakaan Kongres	sh85060043
ID pemerihal MeSH	D006371
ID rencana Klexikon	Helium
ID topik Quora	Helium
InChI	InChI=1S/He
InChIKey	SWQJXJOGLNCZEY-UHFFFAOYSA-N
Italian Vikidia ID	Elio
Krugosvet article	nauka_i_tehnika/himiya/GELI.html
Maksud Tertakrif OmegaWiki	7296
Mindat mineral ID	25563
NALT ID	44987
NDF-RT ID	N0000147379
Online PWN Encyclopedia ID	3910758
OpenAlex ID	C546029482
OpenAlex ID	C2991909631
Pengenal Pasti Arkib Negara A.S.	10640583
Probes And Drugs ID	PD009020
PubChem CID	23987
RxNorm ID	5140
Römpp online ID	RD-08-00783
Spanish Vikidia ID	Helio
UMLS CUI	C0018880
UNII	206GF3GB41
USGS Thesaurus ID	1470
World of Physics ID	Helium
ZVG number	7020
kod ATC	V03AN03
nombor E	E939
nombor pendaftaran CAS	7440-59-7
pengecam NDL	00563132

Helium (He)

Sifat Fizikal

Sifat Kimia

other

Isotopes of Helium

3He

4He

5He

6He

7He

8He

9He

10He

sejarah

sumber

Nuclear Screening Constants

³He

⁴He

⁵He

⁶He

⁷He

⁸He

⁹He

¹⁰He