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Èli - Wikipèdia

Èli

Un article de Wikipèdia, l'enciclopèdia liura.

2 idrogèn ← Èli → -
-
↑
He
↓
Ne
Generalitats
Nom, Simbòl, Numero Èli, He, 2
Tièra quimica gases rars
Grop, Periòde, Blòc 18, 1, s
Aparéncia sens color
Massa atomica 4.002602(2) g/mol
Configuracion electronica 1s2
Electrons per nivèl energetic 2
Proprietats fisicas
Fasa gas
Densitat (0 °C) 0.1787 g/L
Punt de fusion (at 2.5 MPa) 0.95 K
(-272.2 °C, -458.0 °F)
Punt d'ebullicion 4.22 K
(-268.93 °C, -452.07 °F)
Calor de fusion 0.0138 kJ/mol
Calor de vaporizacion 0.0829 kJ/mol
Capacitat calorifica (25 °C) 20.786 J/(mol·K)
Pression de vapor
P/Pa 1 10 100 1 k 10 k 100 k
a T/K         3 4
Proprietats atomicas
Estructura cristallina exagonal

Modèl:Elementbox ionizationenergies2
Rai atomic calculat 31 pm
Rai covalent 32 pm
Rai de Van der Waals 140 pm
Informacions divèrsas
Conductivitat termica (300 K) 151.3 mW/(m·K)
Numèro CAS 7440-59-7
Isotòps mai estables
Article : Isotòps del (de l') eli
iso NA Mièja vida MD ED (MeV) PD
3He 0.000137%* He es estable amb 1 neutrons
4He 99.999863%* He es estable amb 2 neutrons
*Atmospheric value, abundance may differ elsewhere.
Reférencias

L'èli es un element quimic de simbòl He e de numèro atomic 2.

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