33 As Arsénico 74,922 u

Arsénico

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Período
4
Grupo
15
Bloque
p-bloque
Fase (STP)
Solid

El arsénico es un metaloide conocido desde la antigüedad, históricamente célebre como veneno. Se emplea en semiconductores y conservantes de la madera.

Apariencia: Metallic grey

Acerca de Arsénico

Known since antiquity and historically notorious as a poison, arsenic is a metallic-grey metalloid of atomic number 33 and atomic mass 74.922. It is a brittle solid with a density of 5.73 g/cm³. Five valence electrons ([Ar] 3d10 4s2 4p3) give an electronegativity of 2.18 and a first ionization energy of 947 kJ/mol. Albertus Magnus is credited with describing the element around 1250. Despite its toxicity, arsenic has practical uses in semiconductors and, historically, in wood preservatives. It sits in group 15, period 4, sharing that group with nitrogen and phosphorus.

Propiedades físicas

Masa atómica 74.922 u
Densidad 5.727 g/cm³
Punto de fusión 816.9 °C
Punto de ebullición 613.9 °C
Fase a STP Solid
Radio atómico 114.0 pm

Propiedades electrónicas

Electronegatividad 2.18
Energía de ionización 947.0 eV
Afinidad electrónica 78.2 eV
Electrones de valencia 5

Configuración electrónica

Configuración [Ar] 3d¹⁰ 4s² 4p³

Configuración de capas electrónicas

Configuración de capas electrónicas de Arsénico As 2e⁻ 8e⁻ 18e⁻ 5e⁻
Estructura de capas electrónicas de Arsénico: electrones por capa.
Capa Electrones
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 5

Posición en la tabla periódica

Posición de Arsénico en la tabla periódica As

Descubrimiento

Descubierto por: Albertus Magnus
Año: 1250

Bloque y período

Bloque

s p d f

Período

1 2 3 4 5 6 7

Tabla Periódica

Lantánidos Actínidos

Compuestos que contienen Arsénico

Arseniuro de galio

GaAs

Arsina

AsH₃

Más Metaloide

5 B Boro 14 Si Silicio 32 Ge Germanio 51 Sb Antimonio 52 Te Telurio

Frequently Asked Questions

What is Arsénico?
Arsénico (As) is a chemical element with atomic number 33. It is a solid at standard temperature and pressure, classified as a metaloide.
What are the key properties of Arsénico?
Arsénico has an atomic mass of 74.922 u, density of 5.727 g/cm³, melting point of 816.9°C, boiling point of 613.9°C.
What is the electron configuration of Arsénico?
The electron configuration of Arsénico is [Ar] 3d10 4s2 4p3. It is in the p-block of the periodic table.
Who discovered Arsénico?
Arsénico was discovered by Albertus Magnus in 1250.
What is the electronegativity of Arsénico?
Arsénico has an electronegativity of 2.18 on the Pauling scale.