Helij[um] (He)

hemijski element sa simbolom He i atomskim brojem 2

Atomic Number	2
Atomic Weight	4.002602
Maseni broj	4

Group	18
Period	1
Block	s

Proton	2 p⁺
Neutron	2 n⁰
Elektron	2 e^-

Animated Bohrov model atoma of He (Helij[um])

Physical Property

Atomski Radijus	120 pm 134 pm
Molarni volumen	31,8 cm³/mol
covalent radius	46 pm 28 pm
Metallic Radius	122 pm
Ionski radijus
Crystal Radius
Van der Waalsov radijus	140 pm 140 pm 153 pm 236,2 pm
gustoća	0,000164 g/cm³

Chemical Property

energija

proton affinity	177,8 kJ/mol
electron affinity	-19,7 eV/particle
ionization energy	24,587387936 eV/particle 54,41776311 eV/particle

Toplota isparavanja	0,08 kJ/mol
toplota topljenja
standard enthalpy of formation
Elektron

electron shell	2

Valentni elektron	2 ⓘ

electron configuration	1s²ⓘ

oksidacijsko stanje
Elektronegativnost	24,59 eV/particle 0.442712
Electrophilicity Index	0,0674191963846371 eV/particle
fundamental state of matter

agregatno stanje	Gas
gaseous state of matter	Monoatomic
Boiling Point	4,222 K
Melting Point
critical pressure	0,22746 MPa
Kritična temperatura	5,195 K
Trojna tačka	2,177 K 5,043 kPa
appearance
boja	Colorless #ffc0cb #d9ffff #d9ffff
appearance	colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
Indeks prelamanja	1,000035
thermodynamic material property
Thermal Conductivity	0,152 W/(m K)
thermal expansion
molar heat capacity	20,786 J/(mol K)
Specific Heat Capacity	5,193 J/(g⋅K)
heat capacity ratio	5/3
electrical properties
type
Specifična električna provodljivost
electrical resistivity
Superprovodljivost
Magnetizam
type	diamagnetic
magnetic susceptibility (Mass)	-0,0000000059 m³/Kg
magnetic susceptibility (Molar)	-0,0000000000236 m³/mol
magnetic susceptibility (Volume)	-0,00000000105
magnetic ordering
Kirijeva tačka
Néel temperature
struktura
Crystal Structure	Face Centered Cubic (HEX)
lattice constant	3,57 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
Tvrdoća
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
Brzina zvuka	970 m/s
klasifikacija
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
Kvantni brojevi	1S0
space group	225 (Fm_3m)

Isotopes of Helium

Stable Isotopes	2
Unstable Isotopes	6
Natural Isotopes	2

³He

Maseni broj	3
broj neutrona	1
Relative Atomic Mass	3,01602932197 ± 0,00000000006 Da
g-factor	-4,25525062 ± 0,00000006
natural abundance	0,0002 ± 0,0002
Radioaktivnost	stable isotope
Vrijeme poluraspada	Not Radioactive ☢️
spin	1/2
nuclear quadrupole moment	0
datum otkrića	1934
parity	+

⁴He

Maseni broj	4
broj neutrona	2
Relative Atomic Mass	4,00260325413 ± 0,00000000016 Da
g-factor	0
natural abundance	99,9998 ± 0,0002
Radioaktivnost	stable isotope
Vrijeme poluraspada	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
datum otkrića	1908
parity	+

⁵He

Maseni broj	5
broj neutrona	3
Relative Atomic Mass	5,012057224 ± 0,00002147 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	602 ± 22 ys
spin	3/2
nuclear quadrupole moment
datum otkrića	1937
parity	-

decay mode	intensity
n (neutron emission)	100%

⁶He

Maseni broj	6
broj neutrona	4
Relative Atomic Mass	6,018885889 ± 0,000000057 Da
g-factor	0
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	806,92 ± 0,24 ms
spin	0
nuclear quadrupole moment	0
datum otkrića	1936
parity	+

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

⁷He

Maseni broj	7
broj neutrona	5
Relative Atomic Mass	7,027990652 ± 0,000008115 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,51 ± 0,07 zs
spin	3/2
nuclear quadrupole moment
datum otkrića	1967
parity

decay mode	intensity
n (neutron emission)	100%

⁸He

Maseni broj	8
broj neutrona	6
Relative Atomic Mass	8,033934388 ± 0,000000095 Da
g-factor	0
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	119,5 ± 1,5 ms
spin	0
nuclear quadrupole moment	0
datum otkrića	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

Maseni broj	9
broj neutrona	7
Relative Atomic Mass	9,043946414 ± 0,000050259 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,5 ± 2,3 zs
spin	1/2
nuclear quadrupole moment	0
datum otkrića	1987
parity

decay mode	intensity
n (neutron emission)	100%

¹⁰He

Maseni broj	10
broj neutrona	8
Relative Atomic Mass	10,052815306 ± 0,000099676 Da
g-factor	0
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	260 ± 40 ys
spin	0
nuclear quadrupole moment	0
datum otkrića	1994
parity	+

decay mode	intensity
2n (2-neutron emission)	100%

historija

otkrivač ili izumitelj	Sir William Ramsey, Nils Langet, P.T.Cleve
mjesto otkrića	Scotland/Sweden
datum otkrića	1895
Etimologija	Greek: hêlios (sun).
pronunciation	HEE-li-em (engleski)

izvor

Abundance
Abundance in Earth's crust	0,008 mg/kg
natural abundance (okean)	0,000007 mg/L
natural abundance (ljudsko tijelo)
natural abundance (Meteoroidi)
natural abundance (Sunce)	23 %
Abundance in Universe	23 %

Nuclear Screening Constants

0.3125

Helij[um] on ChemicalAid

ATC kod	V03AN03
Australian Educational Vocabulary ID	scot/3528
BNCF pojmovnik	19752
BNF kod	11978648w
Brockhaus Enzyklopädie online ID	helium-20
CAB ID	178029
CAS broj	7440-59-7
ChEBI ID	30217
ChEMBL ID	CHEMBL1796997
ChemSpider ID	22423
Common Procurement Vocabulary	24111300
DSSTOX compound identifier	DTXCID5016402
DSSTox substance ID	DTXSID7036402
De Agostini ID	èlio
Den Store Danske ID	helium
Drugbank ID	09155
ECHA Substance Infocard ID	100.028.334
E broj	E939
Encyclopædia Britannica Online ID	science/helium-chemical-element
Encyclopædia Universalis ID	helium
French Vikidia ID	Hélium
GND	4132459-6
Golden ID	Helium-K8NB
Great Russian Encyclopedia Online ID	2348591
HSDB ID	553
ICSC ID	0603
ID Quora teme	Helium
ID na KBpediji	Helium
InChIKey	SWQJXJOGLNCZEY-UHFFFAOYSA-N
InChl	InChI=1S/He
Italian Vikidia ID	Elio
Klexikon article ID	Helium
Krugosvet article	nauka_i_tehnika/himiya/GELI.html
LCCN	sh85060043
MeSH ID	D006371
Mindat mineral ID	25563
NALT ID	44987
NDF-RT ID	N0000147379
NE.se ID	helium
NKC identifikator	ph503003
Namuwiki ID	헬륨
National Library of Israel J9U ID	987007555644805171
OmegaWiki određeno značenje	7296
Online PWN Encyclopedia ID	3910758
OpenAlex ID	C546029482
OpenAlex ID	C2991909631
PSH ID	5816
Probes And Drugs ID	PD009020
PubChem ID (CID)	23987
RxNorm ID	5140
Römpp online ID	RD-08-00783
Spanish Vikidia ID	Helio
Store norske leksikon ID	helium
Treccani ID	elio
U.S. National Archives Identifier	10640583
UMLS CUI	C0018880
UNII	206GF3GB41
USGS Thesaurus ID	1470
Web NDL autoriteti	00563132
WordNet 3.1 Synset ID	14664099-n
World of Physics ID	Helium
YSO ID	14499
ZVG broj	7020
broj na Freebaseu	/m/025rt79

Helij[um] (He)

Physical Property

Chemical Property

other

Isotopes of Helium

3He

4He

5He

6He

7He

8He

9He

10He

historija

izvor

Nuclear Screening Constants

³He

⁴He

⁵He

⁶He

⁷He

⁸He

⁹He

¹⁰He