2 He Helio 4,0026 u

Helio

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Período
1
Grupo
18
Bloque
s-bloque
Fase (STP)
Gas

El helio es el segundo elemento más ligero y más abundante del universo. Es un gas noble inerte empleado en criogenia y como gas de elevación.

Apariencia: Gas incoloro

Acerca de Helio

Chemically inert and second only to hydrogen in lightness, helium fills atomic number 2 with an atomic mass of 4.0026. Its two electrons complete the 1s shell, a closed configuration reflected in an exceptionally high ionization energy of 2372 kJ/mol and the absence of ordinary chemistry. The colorless noble gas remains liquid closer to absolute zero than any other substance, boiling at just 4.2 K. Pierre Janssen first detected it in 1868, in the spectrum of the Sun rather than on Earth. As the second most abundant element in the universe, helium is valued in cryogenics, where its low boiling point is essential, and as a non-flammable lifting gas—both uses resting on the stability that keeps it from bonding. It sits in group 18.

Propiedades físicas

Masa atómica 4.0026 u
Densidad 0.0001785 g/cm³
Punto de fusión -272.2 °C
Punto de ebullición -268.9 °C
Fase a STP Gas
Radio atómico 31.0 pm

Propiedades electrónicas

Energía de ionización 2372.3 eV
Electrones de valencia 2

Configuración electrónica

Configuración 1s²

Configuración de capas electrónicas

Configuración de capas electrónicas de Helio He 2e⁻
Estructura de capas electrónicas de Helio: electrones por capa.
Capa Electrones
1 (K) 2

Posición en la tabla periódica

Posición de Helio en la tabla periódica He

Descubrimiento

Descubierto por: Pierre Janssen
Año: 1868

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Frequently Asked Questions

What is Helio?
Helio (He) is a chemical element with atomic number 2. It is a gas at standard temperature and pressure, classified as a gas noble.
What are the key properties of Helio?
Helio has an atomic mass of 4.0026 u, density of 0.0001785 g/cm³, melting point of -272.2°C, boiling point of -268.9°C.
What is the electron configuration of Helio?
The electron configuration of Helio is 1s2. It is in the s-block of the periodic table.
Who discovered Helio?
Helio was discovered by Pierre Janssen in 1868.