Helioa (He)

2 zenbaki atomikoa duen elementu kimikoa

Atomic Number	2
Atomic Weight	4.002602
masa-zenbaki	4

Group	18
Period	1
Block	s

protoi	2 p⁺
neutroi	2 n⁰
elektroi	2 e^-

Animated Bohrren eredu atomikoa of He (Helioa)

Propietate Fisiko

Erradio Atomiko	120 pm 134 pm
bolumen molar	31,8 cm³/mol
Erradio Kobalente	46 pm 28 pm
Metallic Radius	122 pm
Erradio ioniko
Crystal Radius
Van der Waalsen erradio	140 pm 140 pm 153 pm 236,2 pm
dentsitatea	0,000164 g/cm³

Magnitude Fisiko

{ERROR}

energia

proton affinity	177,8 kJ/mol
Afinitate elektroniko	−19,7 eV/particle
ionizazio energia	24,587387936 eV/particle 54,41776311 eV/particle

Irakite-entalpia	0,08 kJ/mol
urtze-entalpia
formazio entalpia estandarra
elektroi

elektroi geruza	2

balentzia-elektroi	2 ⓘ

electron configuration	1s²ⓘ

Oxidazio-egoera
Elektronegatibotasun	24,59 eV/particle 0.442712
Electrophilicity Index	0,0674191963846371 eV/particle
materiaren funtsezko egoera

materiaren egoera
materiaren egoera gaseoso	Monoatomic
Boiling Point	4,222 K
Melting Point
critical pressure	0,22746 MPa
critical temperature	5,195 K
Puntu hirukoitz	2,177 K 5,043 kPa
appearance
kolore	Black #ffc0cb #d9ffff #d9ffff
appearance	colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
errefrakzio-indize	1,000035
thermodynamic material property
Thermal Conductivity	0,152 W/(m K)
Bero-dilatazio
molar heat capacity	20,786 J/(mol K)
Specific Heat Capacity	5,193 J/(g⋅K)
indize adiabatiko	5/3
electrical properties
type
Eroankortasun elektriko
Erresistibitate elektriko
Supereroankortasun
Magnetismo
type	diamagnetic
suszeptibilitate magnetiko (Mass)	−0,0000000059 m³/Kg
suszeptibilitate magnetiko (Molar)	−0,0000000000236 m³/mol
suszeptibilitate magnetiko (Volume)	−0,00000000105
magnetic ordering
Curieren tenperatura
Néel temperature
egitura
Crystal Structure	{ERROR}
lattice constant	3,57 Å
Lattice Angles	π/2, π/2, π/2
materialen propietate mekaniko
Gogortasun
konprimagarritasun-modulu
Zizaila modulua
Youngen modulu
Poissonen modulu
Soinuaren lastertasun	970 m/s
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

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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
zenbaki kuantiko	1S0
talde espazial	225 (Fm_3m)

Isotopes of Helium

Stable Isotopes	2
Unstable Isotopes	6
Natural Isotopes	2

³He

masa-zenbaki	3
neutron number	1
Atomo-Masa Erlatibo	3,01602932197 ± 0,00000000006 Da
g-factor	−4,25525062 ± 0,00000006
natural abundance	0,0002 ± 0,0002
desintegrazio erradioaktibo	isotopo egonkor
Semidesintegrazio-periodo	Not Radioactive ☢️
spin	1/2
nuclear quadrupole moment	0
aurkikuntza-data	1934
parity	+

⁴He

masa-zenbaki	4
neutron number	2
Atomo-Masa Erlatibo	4,00260325413 ± 0,00000000016 Da
g-factor	0
natural abundance	99,9998 ± 0,0002
desintegrazio erradioaktibo	isotopo egonkor
Semidesintegrazio-periodo	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
aurkikuntza-data	1908
parity	+

⁵He

masa-zenbaki	5
neutron number	3
Atomo-Masa Erlatibo	5,012057224 ± 0,00002147 Da
g-factor
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	602 ± 22 ys
spin	3/2
nuclear quadrupole moment
aurkikuntza-data	1937
parity	-

decay mode	intensity
n (neutron emission)	100%

⁶He

masa-zenbaki	6
neutron number	4
Atomo-Masa Erlatibo	6,018885889 ± 0,000000057 Da
g-factor	0
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	806,92 ± 0,24 ms
spin	0
nuclear quadrupole moment	0
aurkikuntza-data	1936
parity	+

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

⁷He

masa-zenbaki	7
neutron number	5
Atomo-Masa Erlatibo	7,027990652 ± 0,000008115 Da
g-factor
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	2,51 ± 0,07 zs
spin	3/2
nuclear quadrupole moment
aurkikuntza-data	1967
parity

decay mode	intensity
n (neutron emission)	100%

⁸He

masa-zenbaki	8
neutron number	6
Atomo-Masa Erlatibo	8,033934388 ± 0,000000095 Da
g-factor	0
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	119,5 ± 1,5 ms
spin	0
nuclear quadrupole moment	0
aurkikuntza-data	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

masa-zenbaki	9
neutron number	7
Atomo-Masa Erlatibo	9,043946414 ± 0,000050259 Da
g-factor
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	2,5 ± 2,3 zs
spin	1/2
nuclear quadrupole moment	0
aurkikuntza-data	1987
parity

decay mode	intensity
n (neutron emission)	100%

¹⁰He

masa-zenbaki	10
neutron number	8
Atomo-Masa Erlatibo	10,052815306 ± 0,000099676 Da
g-factor	0
natural abundance
desintegrazio erradioaktibo	☢️ radioactive element
Semidesintegrazio-periodo	260 ± 40 ys
spin	0
nuclear quadrupole moment	0
aurkikuntza-data	1994
parity	+

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

historia

aurkitzailea edo asmatzailea	Sir William Ramsey, Nils Langet, P.T.Cleve
aurkikuntzaren lekua	Scotland/Sweden
aurkikuntza-data	1895
etimologia	Greek: hêlios (sun).
pronunciation	HEE-li-em (ingelesa)

source

Abundance
Abundance in Earth's crust	0,008 mg/kg
natural abundance (ozeano)	0,000007 mg/L
natural abundance (gizakiaren gorputza)
natural abundance (Meteoroide)
natural abundance (Eguzkia)	23 %
Abundance in Universe	23 %

Nuclear Screening Constants

0.3125

Helioa on ChemicalAid

Helioa (He)

Propietate Fisiko

Magnitude Fisiko

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Isotopes of Helium

3He

4He

5He

6He

7He

8He

9He

10He

historia

source

Nuclear Screening Constants

³He

⁴He

⁵He

⁶He

⁷He

⁸He

⁹He

¹⁰He