34 Se Selenio 78,971 u

Selenio

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Período
4
Grupo
16
Bloque
p-bloque
Fase (STP)
Solid

El selenio es un oligoelemento esencial para el ser humano en pequeñas cantidades. Se usa en vidrio, electrónica y células solares.

Apariencia: Black, red, and gray allotropes

Acerca de Selenio

Selenium is a nonmetal that occurs in several allotropes—black, red, and gray forms—and carries atomic number 34 with an atomic mass of 78.971. The gray form is a solid with a density of 4.81 g/cm³ that melts at 494 K. Six valence electrons ([Ar] 3d10 4s2 4p4) give an electronegativity of 2.55 and a first ionization energy of 941 kJ/mol. Jöns Jacob Berzelius discovered the element in 1817. An essential trace element for humans in small amounts, selenium is also used in glass, electronics, and solar cells. It belongs to group 16, period 4, in the same family as oxygen and sulfur.

Propiedades físicas

Masa atómica 78.971 u
Densidad 4.809 g/cm³
Punto de fusión 220.9 °C
Punto de ebullición 684.9 °C
Fase a STP Solid
Radio atómico 103.0 pm

Propiedades electrónicas

Electronegatividad 2.55
Energía de ionización 941.0 eV
Afinidad electrónica 195.0 eV
Electrones de valencia 6

Configuración electrónica

Configuración [Ar] 3d¹⁰ 4s² 4p⁴

Configuración de capas electrónicas

Configuración de capas electrónicas de Selenio Se 2e⁻ 8e⁻ 18e⁻ 6e⁻
Estructura de capas electrónicas de Selenio: electrones por capa.
Capa Electrones
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 6

Posición en la tabla periódica

Posición de Selenio en la tabla periódica Se

Descubrimiento

Descubierto por: Jons Jacob Berzelius
Año: 1817

Bloque y período

Bloque

s p d f

Período

1 2 3 4 5 6 7

Tabla Periódica

Lantánidos Actínidos

Más No Metal

1 H Hidrógeno 6 C Carbono 7 N Nitrógeno 8 O Oxígeno 15 P Fósforo 16 S Azufre

Frequently Asked Questions

What is Selenio?
Selenio (Se) is a chemical element with atomic number 34. It is a solid at standard temperature and pressure, classified as a no metal.
What are the key properties of Selenio?
Selenio has an atomic mass of 78.971 u, density of 4.809 g/cm³, melting point of 220.9°C, boiling point of 684.9°C.
What is the electron configuration of Selenio?
The electron configuration of Selenio is [Ar] 3d10 4s2 4p4. It is in the p-block of the periodic table.
Who discovered Selenio?
Selenio was discovered by Jons Jacob Berzelius in 1817.
What is the electronegativity of Selenio?
Selenio has an electronegativity of 2.55 on the Pauling scale.